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Awesome C

A curated list of C good stuff. Contributions are welcome.

An important note: first and foremost linked resources are for C, thereforeC++ is an afterthought.

Note: there are several awesome-c lists already, but they are havingsomewhat different sets of libraries in them. This list tries to incorporatethem all, and many more other resources. Consider it my personal cheat sheet andindex for easier search instead of github stars. Also, original list categoriesare a mess.

Note: all licenses after project descriptions are leading to actual licensetext or declaration, if any provided. Source code with no license attached isconsidered as automatically copyrighted by law or it is falling under the caseof terms of service of provided source code publication and hosting service, sokeep this in mind. Also, probably sometimes license can be provided ormentioned, but I've failed to find it.

I am not an attorney btw.

Incorporated lists:

https://github.com/aleksandar-todorovic/awesome-c (rare updates, too vague andsometimes mismatched categories, not very wide selection of content)
https://github.com/kozross/awesome-c (updated regularly, but has even lesscontent than one above)
https://github.com/uhub/awesome-c (regular updates, much more content thanprevious two, but much more of it doesn't even belong to C list. Also, nostructure at all)

Index

Meta

Uncategorized

`^` AI

Neural nets, machine learning, pattern recognition etc.

cjac/cmusphinx - CMU Sphinx - Speech Recognition Toolkit.Licenses
100/Cranium - A portable, header-only, artificial neural networklibrary written in C99.MIT
pjreddie/darknet - Convolutional Neural Networks.License
TheWeatherChannel/dClass - Device Classification Engine.Apache 2
2hanson/DecisionTree - Decision Tree.MIT
yusugomori/DeepLearning - Deep Learning (several languages, Cincluded).MIT
encog/encog-c - C implementation of Encog - machine learningframework for Java/C#.No license
codeplea/genann - simple neural network library in ANSI C.Zlib
attractivechaos/kann - Two-file ANN library.MIT
Blei-Lab/lda-c - This is a C implementation of variational EM forlatent Dirichlet allocation (LDA), a topic model for text or other discretedata.LGPL 2.1
jppbsi/LibDEEP - Deep learning library.No license
H2CO3/libsprec - C library for speech recognition using the GoogleSpeech API.License
robwhess/opensift - Open-Source SIFT Library.License
dake/openVP - Voice Print Recognition in C language.No license
cmusphinx/pocketsphinx - Lightweight speech recognition engine,specifically tuned for handheld and mobile devices, though it works equallywell on the desktop.BSD 2-Clause
HIPS/Probabilistic-Backpropagation - Implementation in C and Theanoof the method Probabilistic Backpropagation for scalable Bayesian inference indeep neural networks.BSD 3-Clause
GHamrouni/Recommender - A C library for productrecommendations/suggestions using collaborative filtering (CF).BSD 2-Clause
ufoym/recursive-bf - A lightweight library for recursive bilateralfiltering.MIT
xiph/rnnoise - Recurrent neural network for audio noise reduction.License
antirez/shapeme - Evolve images using simulated annealing.BSD 2-Clause
symisc/sod - An Embedded Computer Vision & Machine Learning Library(CPU Optimized & IoT Capable).GPL 3
iunderstand/SWE - Learning Semantic Word Embeddings based onOrdinal Knowledge Constraints.Apache 2
glouw/tinn - The tiny neural network library.MIT
canyalniz/CNN-Inference-Didactic - A readable CNN Inferenceimplementation in C.GPL 3

Algoritm Implementations

`^` Algoritm Implementations

Some generic agoritms or ones with no specific attachments.

dhuertas/AES - AES algorithm implementation in C.No license
mischasan/aho-corasick - A-C implementation in "C". Tight-packed(interleaved) state-transition matrix.LGPL 3
davidreynolds/algorithms - A repository of assorted algorithms anddata structures.No license
BigZaphod/AStar - C Implementation of the A* Pathfinding Algorithm.License
citiususc/BigBWA - Approaching the Burrows-Wheeler Aligner to BigData Technologies.GPL 3
TheAlgorithms/C - All Algorithms implemented in CNo license
chaoslawful/ccard-lib - C library for estimating cardinality instreams for which it is infeasible to store all events in memory.No license
agl/curve25519-donna - Implementations of a fast Elliptic-curveDiffie-Hellman primitive.License
aimxhaisse/des - C implementation of DES.License
tarequeh/DES - Implementation of Data Encryption Standard in C.MIT
blynn/dlx - Implementation of Knuth's Algorithm X, with examplesolvers.GPL 3
oap/ekf-angles - Extended Kalman Filter for Accelerometer and Gyrodata.No license
Cyan4973/FiniteStateEntropy - Finite State Entropy and Huff0.BSD 2-Clause
BlackLight/fkmeans - A tiny library in C for managing kmeansclusterization algorithm over arbitrary data sets, both by manually specifyingthe number k of clusters and computing it automatically using Schwarzcriterion.GPL 3
kljensen/Gemoda - A generic motif discovery algorithm forsequential data.GPL 2
lacker/ikalman - An iPhone-friendly Kalman filter written in C.MIT
tsuraan/Jerasure - C Implementation of Reed-Solomon coding.License
jmcejuela/Levenshtein-MySQL-UDF - General Levenshtein algorithm andk-bounded levenshtein distance in linear time and constant space.LGPL 3
CVLearner/Mixture-of-Gaussians - Fit a Gaussian mixture model givena set of data.MIT
richarddurbin/pbwt - Implementation of Positional Burrows-WheelerTransform for genetic data.License
ntamas/plfit - Fitting power-law distributions to empirical data,according to the method of Clauset, Shalizi and Newman.License
Kevincav/Radix-Sort - Radix Sort with different data types.MIT
duckythescientist/obfuscatedLife - Conway's Game of Life in 9 linesof C.No license
kokke/tiny-AES-c - Small portable AES128/192/256 in C.Unlicense
kroitor/gjk.c - Gilbert-Johnson-Keerthi (GJK) collision detectionalgorithm in 200 lines of clean plain C.WTFPL
ai-ku/scode - Sphere embedding (s-code) is a variation of Euclideanembedding of co-occurence data (code).MIT
swenson/sort - Collection of sorting routines, which type-specializeat compile-time with a user-defined type.MIT
msteinbeck/tinyspline - ANSI C library for NURBS, B-Splines, andBézier curves with interfaces for C++, C#, D, Java, Lua, Octave, PHP, Python,R, and Ruby.MIT
ferreiradaselva/uastar - Minimal A* implementation.Zlib
madler/crcany - CRC calculation library.Zlib

Argument Parsing

`^` Argument Parsing

cofyc/argparse - Command-line arguments parsing library.MIT
clibs/commander - Commander option parser ported to C - simple API,auto-generated --help.MIT
docopt/docopt.c - Implementation of a command-line option parser.MIT
clibs/flag - Go-style flag parsing for C.MIT
jibsen/parg - A single-file reimplementation of getopt with betterdefaults.License

Calculations and Math

`^` Calculations and Math

b-k/apophenia - Library for statistical and scientific computing.GPL 2
fredrik-johansson/arb - Library for arbitrary-precision intervalarithmetic.LGPL 2.1
ATLAS - Automatically Tuned Linear Algebra Software.License
BLAS - Basic Linear Algebra Subprograms; a set of routines thatprovide vector and matrix operations.License
Lichtso/CCWT - Complex Continuous Wavelet Transformation.MIT
CDFLIB - Library with routines to evaluate cumulative densityfunctions for a variety of standard probability distributions.Also can compute one parameter of the CDF given the others.No license
ScientificC/cmathl - Pure-C Math library with a great variety ofmathematical functions and CMake build support. Seeks to be close to C89/C90compliant for portability.MIT
Cuba - Library for multidimensional numerical integration.LGPL
adis300/fft-c - A high-performance Fourier Transform from netlib'sfftpack; wrapped in a user-friendly format.MIT
FFTW - The Fastest Fourier Transform in the West; ahighly-optimized fast Fourier transform routine.GPL 2
FLINT - Fast Library for Number Theory; a library supportingarithmetic with numbers, polynomials, power series and matrices, among others.LGPL 2.1
gjrand - Library of random-number generation routines.GPL 2
GLPK - GNU Linear Programming Kit; a package designed for solvinglarge-scale linear programming, mixed integer programming and other relatedproblems.GPL 3
GMP - GNU Multple Precision Arithmetic Library; a library forarbitrary-precision arithmetic.Licenses
GNU MPC - Library for complex number arithmetic.LGPL 3
GNU MPFR - Library for arbitrary-precision floating-pointarithmetic.LGPL 3
GNU MPRIA - Portable mathematics library for multi-precisionrational interval arithmetic.GPL 3
GSL - The GNU Scientific Library; a sophisticated numericallibrary.GPL3
HdrHistogram/HdrHistogram_c - C port of the HdrHistogram.License
igraph- Library for creating and manipulating large graphs.GPL2
KISS FFT - Very simple fast Fourier transform library.BSD
LAPACKE - C interface to LAPACK.License
PARI/GP - Computer algebra system for number theory; includes acompiler to C.GLP
PETSc - Suite of data structures and routines for scalable parallelsolution of scientific applications modelled by partial differentialequations.License
PROB - Library that handles various discrete and continuousprobability density functions.LGPL 3
PetteriAimonen/libfixmatrix - C library for fixed point matrix,quaternion and vector calculations.MIT
canonizer/libgpuvm - library which simplifies host-GPU datatransfer using userspace pagefault handling.No license
libtom/libtommath - LibTomMath is a free open source portablenumber theoretic multiple-precision integer library written entirely in C.Unlicense
JuliaMath/openlibm - High quality system independent, portable,open source libm implementation.License
imneme/pcg-c - PCG — C Implementation.Apache 2
imneme/pcg-c-basic - PCG — Minimal C Implementation.Apache 2
libtom/tomsfastmath - TomsFastMath is a fast public domain, opensource, large integer arithmetic library written in portable ISO C.Licenses
cvxgrp/scs - C package that solves convex cone problems viaoperator splitting.MIT
SLEPc - Library for the solution of large, sparse eigenvalueproblems on parallel computers.BSD 2-Clause
slim-curve/slim-curve - SLIM Curve: a package for exponential curvefitting of combined spectral lifetime image data.GPL 3
tinyexpr - Tiny recursive-descent parser, compiler and evaluationengine for simple mathematical expressions.Zlib
Yeppp! - Very fast, SIMD-optimized mathematical library.License
PetteriAimonen/libfixmath - Cross Platform Fixed Point MathsLibrary.MIT
datenwolf/linmath.h - Linear math as required for computer graphics.WTFPL

Compression

`^` Compression

Blosc/bcolz - Fast, multi-threaded, meta-compressor library.Licenses
kiyo-masui/bitshuffle - Filter for improving compression of typedbinary data.License
google/brotli - Generic lossless compression algorithm based onLZ77, Huffman coding and 2nd order context modelling.MIT
bzip2 - Patent-free, high-quality data compression library.BSD 4-Clause
Blosc/c-blosc - A blocking, shuffling and loss-less compressionlibrary that can be faster than memcpy().Licenses
clzip - C lzip implementation.GPL 2
richox/comprox - An experimental lossless data compression programwith high compression ratio.BSD 3-Clause
RoaringBitmap/CRoaring - Roaring bitmaps in C (and C++).Apache 2
adnanozsoy/CUDA_Compression - A GPU-based LZSS compressionalgorithm, highly tuned for NVIDIA GPGPUs and for streaming data, leveragingthe respective strengths of CPUs and GPUs together.Apache 2
centaurean/density - Superfast compression library.BSD 3-Clause
gildor2/fast_zlib - Improved zlib, which runs 2 to 10 times faster.BSD 3-Clause
Cyan4973/FiniteStateEntropy - Two efficient compression codecsoptimized for modern CPUs.BSD 2-Clause
rjsikarwar/gpu_compression - Nine Light weight Schemes to Compressand Decompress the data of Database Using GPU and also a planer.No license
atomicobject/heatshrink - data compression library forembedded/real-time systems.ISC
adamierymenko/huffandpuff - Minimal Huffman encoder and decoder.Public domain
libarchive/libarchive - Multi-format archive and compressionlibrary.Licenses
nih-at/libzip - A C library for reading, creating, and modifyingzip archives.BSD 3-Clause
inikep/lizard - Formerly LZ5. Achieves compression ratioscomparable with zip and zlib at decompression speeds of 1000MB/s and faster.Licenses
lz4/lz4 - Extremely Fast Compression algorithm.Licenses
lzo - Very fast data compression library.GPL 2
richgel999/miniz - Single C source file zlib-replacement library.License
moinakg/pcompress - A Parallelized Data Deduplicationand Compression utility.LGPL 3
vasi/pixz - Parallel, indexed xz compressor.BSD 2-Clause
mist64/pucrunch - pucrunch, an Optimizing Hybrid LZ77 RLE DataCompression Program for C64/C128/VIC-20/Plus4.LGPL 2.1
quicklz - Fast compression library.Licenses
Ed-von-Schleck/shoco - Compressor for small text strings.MIT
lemire/simdcomp - Simple library for compressing lists of integersusing binary packing. Makes use of SIMD instructions on x86.BSD 3-Clause
antirez/smaz - Small strings compression library.BSD 3-Clause
andikleen/snappy-c - C port of the snappy compressor.License
quixdb/squash - Compression abstraction library, complete withutilities.MIT
powturbo/TurboPFor - Fast integer compression.GPL 2
powturbo/TurboRLE - Fastest Run Length Encoding.GPL 2
kuba--/zip - A portable, simple zip library written in C.Unlicense
madler/zlib - Massively-spiffy yet delicately-unobtrusivecompression library.Zlib
zlib-ng/zlib-ng - zlib replacement with optimizations for"next generation" systems.Zlib
facebook/zstd - Fast real-time compression algorithm.BSD 3-Clause
jsvennevid/filearchive - File archive library allowing for easycreation and access to data stored inside a container through a simple API.MIT
ariya/FastLZ - Byte-aligned LZ77 compression.License

Concurrency and Parallelism

`^` Concurrency and Parallelism

yosefk/checkedthreads - A simple library for parallelism, withbuilt-in checking for race conditions.BSD 2-Clause
FCFS RWLock - First-come first-served Readers/Writers lock for POSIXthreads.Licenses
sharow/libconcurrent - Concurrent programming library, usingcoroutines, for C11.Zlib
liburcu - Data synchronization library, which scales linearly withthe number of cores.LGPL 2.1
cchan - Small library for channel constructs for inter-threadcommunication.Public Domain
pmodels/mpich - Another implementation of MPI.License
open-mpi/ompi - Message passing interface implementation.License
GNU pth - Portable implementation for non-preemptive priority-basedscheduling for multiple threads of execution.LGPL 2.1
POSIX threads - The POSIX thread library.No license
tinycthread/tinycthread - Portable, small implementation of the C11threads API.License
Pithikos/C-Thread-Pool - A minimal but powerful thread pool inANSI C.MIT
baruch/libwire - User space threading (aka coroutines) library forC resembling GoLang and goroutines.MIT
bjoernknafla/amp - C portable low-level assemblies for parallelismand threading.BSD 3-Clause
bjoernknafla/peak - Parallelism exploration assembly kit. C toolkitto experiment with task- and data-parallelism.BSD 3-Clause
cloudwu/coroutine - A asymmetric coroutine library for C.MIT
concurrencykit/ck - Concurrency primitives, safe memory reclamationmechanisms and non-blocking (including lock-free) data structures designed toaid in the research, design and implementation of high performance concurrentsystems developed in C99+.Licenses
etmc/lemon - Lemon is an MPI parallel I/O library that is intendedto allow for efficient parallel I/O of both binary and metadata on massivelyparallel architectures. Data is stored in the SciDAC Lattice QCD InterchangeMessage Encapsulation format, that allows for storing large blocks of binarydata and corresponding metadata in the same file.GPL 3
geertj/cgreenlet - Coroutines for C/C++.MIT
halayli/lthread - lthread, a multicore enabled coroutine librarywritten in C.BSD 2-Clause
hnes/libaco - A blazing fast and lightweight C asymmetric coroutinelibrary.Apache 2
jtsiomb/c11threads - Trivial C11 threads.h implementation overPOSIX threads.Public domain
matianfu/FUNK - a c continuation library inspired by Adam Dunkel'sProtoThread.Apache 2
mbrossard/threadpool - A simple C Thread pool implementation.BSD 2-Clause
oneoo/alilua-coevent-module - epoll base coroutine module.MIT
ramonza/libcoro - Lightweight C coroutines.BSD 2-Clause
sustrik/libdill - Structured concurrency in C.MIT
sustrik/libmill - Go-style concurrency in C.MIT
stevedekorte/coroutine - C multiplatform coroutine implementationvia ucontext, fibers or setjmp.No license
parallella/pal - An optimized C library for math, parallelprocessing and data movement.Apache 2
danluu/setjmp-longjmp-ucontext-snippets - Implementing coroutines,channels, message passing, etc.Apache 2
Precisamento/cpthreads - Cross Platform (e.g. Windows) supportfor C11 threads.MIT
shiyanhui/libcsp - Concurrency C library influenced by the CSPmodel.MIT

Cryptography

`^` Cryptography

GNU SASL - Implementation of the Simple Authentication and SecurityLayer and few common SASL mechanisms.Licenses
aidansteele/sphlib - Set of implementations of various hashfunctions, including several cryptographic ones.MIT
GnuTLS - Secure communication library, implementing SSL, TLS andDTLS.LGPL 2.1
libgcrypt - General-purpose cryptography library, with a range ofavailable ciphers.Licenses
OpenSSL - Implementation of the SSL and TLS protocols, and alsoincludes a cryptography library.Licenses
jedisct1/libsodium - A modern, portable and easy to use cryptolibrary.ISC
ARMmbed/mbedtls - An open source, portable, easy to use, readableand flexible SSL library.License
B-Con/crypto-algorithms - Basic implementations of standardcryptography algorithms, like AES and SHA-1.No license
WickrInc/wickr-crypto-c - An implementation of the Wickr SecureMessaging Protocol in C.License
ashwinraghav/Parallel_Open_SSL - Use your idle GPU to encrypt yourdata. Give your CPU some breathing time!Licenses
awslabs/s2n - s2n : an implementation of the TLS/SSL protocols.Apache 2
bitcoin-core/secp256k1 - Optimized C library for EC operations oncurve secp256k1.MIT
cloudflare/keyless - CloudFlare's Keyless SSL Server ReferenceImplementation.Agreement
ctz/cifra - A collection of cryptographic primitives targeted atembedded use.License
cyassl/cyassl - Small, fast, portable implementation of TLS/SSL forembedded devices to the cloud.GPL 2
eduardsui/tlse - Single C file TLS 1.2/1.3 implementation, usingtomcrypt as crypto library.BSD 2-Clause
h2o/picotls - TLS 1.3 implementation in C (master supports RFC8446as well as draft-26, -27, -28).License
jedisct1/libhydrogen - A lightweight, secure, easy-to-use cryptolibrary suitable for constrained environments.ISC
libressl-portable/openbsd - LibreSSL source code.Licenses
libtom/libtomcrypt - LibTomCrypt is a fairly comprehensive, modularand portable cryptographic toolkit that provides developers with a vast arrayof well known published block ciphers, one-way hash functions, chaining modes,pseudo-random number generators, public key cryptography and a plethora ofother routines.Licenses
maciejczyzewski/retter - A collection of hash functions, ciphers,tools, libraries, and materials related to cryptography.No license
mikeryan/crackle - Crack and decrypt BLE encryption.BSD 2-Clause
open-quantum-safe/liboqs - C library for quantum-resistantcryptographic algorithms.MIT
tbuktu/libntru - C Implementation of NTRUEncrypt.Licenses
trezor/trezor-crypto - Heavily optimized cryptographyalgorithms for embedded devices.MIT
droe/sslsplit - Transparent SSL/TLS interception.BSD 2-Clause
orlp/ed25519 - Portable C implementation of Ed25519, a high-speedhigh-security public-key signature system.Zlib
wolfSSL/wolfssl - wolfSSL (formerly CyaSSL) is a small, fast,portable implementation of TLS/SSL for embedded devices to the cloud.GPL 2
rg3/bcrypt - bcrypt password hash C library.License
LoupVaillant/Monocypher - An easy to use, easy to deploy cryptolibrary.Licenses
tombonner/blowfish-api - Blowfish block cipher implementation.License

Databases

`^` Databases

priitj/whitedb - Lightweight database library, operating entirely inmain memory.GPL 3
mongodb/mongo-c-driver - High-performance client library forMongoDB.Apache 2
SQLite - Self-contained, serverless, zero-configuration,transactional SQL database engine with a C interface.Public domain
symisc/unqlite - Self-contained, serverless, zero-configuration,transactional NoSQL engine with a C interface.License
Akash91/CoSQL - A Co-Relational Key-Value Data Store.No license
GNOME/libgda - Libgda is a (relatively small) database accesslibrary.GPL 2
Softmotions/ejdb - EJDB — Embeddable JSON Database engine.MIT
aerospike/aerospike-client-c - Aerospike C Client.License
bcmpinc/dagdb - small database for storing semi-structured data.GPL 3
maciejczyzewski/hashbase - A fast, efficient on-disk/in-memorydatabase with many different kind of data structures.MIT
maxmind/libmaxminddb - C library for the MaxMind DB file format.Apache 2
pmwkaa/sophia - modern emeddable key-value database.License
redis/hiredis - Minimalistic C client for Redis.BSD 3-Clause
seppo0010/rlite - self-contained, serverless, zero-configuration,transactional redis-compatible database engine. rlite is to Redis what SQLiteis to SQL.BSD 2-Clause
sqlcipher/sqlcipher - SQLCipher is an SQLite extension thatprovides 256 bit AES encryption of database files.License
tglman/orientdb-c - The C client of OrientDB.No license
spotify/sparkey - Simple constant key/value storage library, forread-heavy systems with infrequent large bulk inserts.Apache 2
vrogier/ocilib - Open source C and C++ library for accessingOracle databases.Apache 2
symisc/vedis - An Embedded Implementation of Redis.License
orca-zhang/influxdb-c - C write client for InfluxDB.MIT
t3rm1n4l/lightkv - Key-value data storage.No license

Data Structures and Types

`^` Data Structures and Types

recp/ds - Common Data Structures and Algorithms.MIT
P-p-H-d/mlib - Library for generic, but typesafe C containers.Implemented as header-only.BSD 2-Clause
libsrt - Soft and hard real-time data structures.BSD 3-Clause
nbulischeck/list.h - Implementations for single- and double-linkedlist functions.GPL 3
gpakosz/PackedArray - Random-access array of tightly packed unsignedintegers of any desired width. Has a SIMD-optimized implementation.WTFPL
swenson/vector.h - Header library for typed lists.MIT
20centaurifux/datatypes - A collection of various datatypes in C(linked lists, stack, queue, red-black tree and hash table).GPL 3
ClickerMonkey/CDSL - A data structure library written in C.License
Incarnation-p-lee/libds - Unified data structure implementationlibrary of C.GPL 2
LPD-EPFL/ASCYLIB - Concurrent-search data-structure library withover 30 implementantions of linked lists, hash tables, skip lists, and binarysearch trees.GPL 2
MichaelJWelsh/cdsa - A library of generic intrusive data structuresand algorithms in ANSI C.ISC
ZSShen/C-Common-Data-Structures - Uniform C APIs for data structuremanipulation.No license
agl/critbit - Critbit trees in C.No license
antirez/rax - A radix tree implementation in ANSI C.BSD 2-Clause
armon/libart - Adaptive Radix Trees implemented in C.BSD 3-Clause
ashinkarov/trie - Simple implementation of trie data structure.License
bcopeland/em_misc - External memory data structure playground.No license
begeekmyfriend/bplustree - A minimal but extreme fast B+ treeindexing structure demo for billions of key-value storage.MIT
chrismoos/hash-ring - C hash ring library.Apache 2
chriso/bitset - A compressed bitset with supporting data structuresand algorithms.LGPL
codeprepper/data-structures - Arrays, linked lists, stacks andqueues.MIT
dminor/skip-quadtree - Implementation of the skip quadtree andcompressed quadtree data structures.License
douglascrockford/DEC64 - Decimal floating point.No license
fmela/libdict - C library of key-value data structures with anobject-oriented interface.BSD 2-Clause
fragglet/c-algorithms - A library of common data structures andalgorithms written in C.ISC
gnudennis/ds_c - Data Structure In C.No license
graphitemaster/libintrusive - Intrusive data structures for C.Unlicense
grundprinzip/bitcompressedvector - Provide a container for integraldata types that applies light-weight bit compression.License
hacatu/haclib - A utility library providing data types C shouldhave been made with such as vectors and sequences, mostly as macros.MPL 2
hyPiRion/c-rrb - RRB-tree implemented as a library in C.MIT
hyPiRion/roulette-tree - Data structure for efficientfitness-proportionate selection.MIT
jarun/dslib - A library of handy data structures.GPL 3
johnj/llds - Low-Level Data Structure - efficient data structures,and fast data access in the 2.6/3.0 kernel.License
jtsiomb/kdtree - A simple C library for working with KD-Trees.License
jvirkki/libbloom - A simple and small bloom filter implementationin plain C.BSD 2-Clause
ksheedlo/kmdata - Data structures for C programmers, byC programmers.No license
louiswins/RB-Tree - An implementation of the Red-Black Tree datastructure.No license
livioso/datastructures-in-C - Implementation of a some datastructures in C for educational purposes.No license
malbrain/Btree-source-code - A working project for High-concurrencyB-tree source code in C.License
michaeltyson/TPCircularBuffer - A simple, fast circular bufferimplementation.License
mikedlowis/data-structures - A collection of data structuresimplemented in C to be included in multiple projects.BSD 2-Clause
naraing/dsLib - An algorithm library with core data-sttructures andcommon algortihm implementations on those data structures.GPL 3
noporpoise/BitArray - C bit array structs and methods.License
orangejulius/cs_fundamentals - simple implementations of commondata structures/algorithms.GPL 3
paulasmuth/libsmatrix - thread-safe sparse matrix data structure.MIT
pcdavid/data-structures - Sample implementations of classical datastructures in C.WTFPL
petewarden/c_hashmap - A simple string hashmap in C.Public domain
rxi/map - A type-safe hash map implementation for C.MIT
rxi/vec - A type-safe dynamic array implementation for C.MIT
siganakis/tny - Tiny data structures that pack a punch!License
srdja/Collections-C - A library of generic data structures.LGPL 3
steven-schronk/C-Data-Structures - Collection of basic datastructures in C.GPL 3
wasabiz/xrope - rope data structure.No license
torch/tds - Torch C data structures.License
watmough/jwHash - Simple hash table implementation for C.Apache 2
zhemao/libds - Simple, memory-safe data-structures in C.MIT
willemt/cbuffer - A circular buffer written in C using Posix callsto create a contiguously mapped memory space.License
xant/libhl - Simple and fast C library implementing a thread-safeAPI to manage hash-tables, linked lists, lock-free ring buffers and queues.LGPL 3
yuyuyu101/C-Buffered-tree - A buffered-tree implemented indictionary type and more.MIT
MagerValp/AsmHeap - Heap data structure in 6502 assembler.No license
Snaipe/libcsptr - Smart pointers in C.MIT
C-Macro-Collections - Generate simple and generic data structuresusing macros.MIT
troydhanson/uthash - C macros for hash tables and more.License
begeekmyfriend/CuckooFilter - Substitute for bloom filter.License
bitly/dablooms - Scaling, counting, bloom filter library.MIT
krglaws/KyleStructs - Simple data structures written foreducational purposes.No license
armon/c-minheap-array - Implements a Min-Heap / Priority Queuein C using a simple array.BSD 3-Clause
jstimpfle/rb3ptr - Red-black tree in C.License

Events

`^` Events

libev - Yet another event loop.BSD 2-Clause
libevent - Event loop replacement for network servers.BSD 3-Clause
Lupus/libevfibers - Small C fiber library that uses libev based event loop and libcoro based coroutine context switching.Apache 2
facebook/libphenom - An eventing framework for building high performance and high scalability systems in C.Apache 2
libuv/libuv - Cross-platform asychronous I/O.Licenses
ithewei/libhv - Event-loop with non-blocking IO and timer.BSD 3-Clause

Foreign Function Interfaces

`^` Foreign Function Interfaces

GNU Libffcall - Collection of libraries for building foreignfunction interfaces.GPL 3
dyncall - Another foreign function interface library.License
atgreen/libffi - A portable foreign-function interface library.License
dyu/ffi-overhead - comparing the c ffi overhead on variousprogramming languages.Apache 2
jmckaskill/luaffi - Standalone FFI library for calling C functionsfrom lua. Compatible with the luajit FFI interface.License
taviso/ctypes.sh - A foreign function interface for bash.MIT

Filetype Targets

Libraries for working with specific filetypes or classes of filetypes.

╠════ Binaries

`^` Binaries

bfd - Library for manipulating binary object files. Part of GNUbinutils.Licenses
0intro/libelf - Simple library for parsing ELF files.MIT
fuzxxl/memf - Portable scanf/printf-like functions to marshalbinary data.BSD 2-Clause
nicklockwood/FastCoding - A faster and more flexible binary fileformat replacement for NSCoding, Property Lists and JSON.License
abiggerhammer/hammer - Parser combinators for binary formats.GPL 2

╠════ CSV

`^` CSV

rgamble/libcsv - Simple, streaming CSV parser.LGPL 2.1
tadasv/csv_parser - Callback based (SAX like) CSV Parser for C.MIT

╠════ HTML

`^` HTML

lexborisov/Modest - Modest is a fast HTML renderer implemented as apure C99 library with no outside dependencies.LGPL 2.1
lexborisov/myhtml - Fast C/C++ HTML 5 Parser. Using threads.LGPL 2.1
htacg/tidy-html5 - The granddaddy of HTML tools, with support formodern standards.License
google/gumbo-parser - HTML5 parsing library in C99.Apache 2

╠════ JSON

`^` JSON

NeonMercury/jfes - JSON For Embedded Systems; simple JSON enginewithout any dependencies.MIT
zserge/jsmn - Minimalistic JSON parser.MIT
netmail-open/wjelement - Advanced JSON manipulation library, withsupport for JSON Schema.Licenses
DaveGamble/cJSON - Ultralightweight JSON parser in ANSI C.MIT
akheron/jansson - C library for encoding, decoding and manipulatingJSON data.MIT
armink/struct2json - A fast convert library between the JSON and Cstructure. Implement structure serialization and deserialization for C.MIT
cesanta/frozen - JSON parser and generator for C/C++ withscanf/printf like interface. Targeting embedded systems.Apache 2
cloudflare/lua-resty-json - JSON library for Lua and C.BSD 2-Clause
json-c/json-c - Official code repository for json-c.License
keenerd/jshon - JSON parser designed for maximum convenience withinthe shell.MIT
kgabis/parson - Lightweight JSON library written in C.MIT
kevinbirch/kanabo - Query JSON/YAML data with JSONPath.License
lloyd/yajl - A fast streaming JSON parsing library in C.ISC
orangeduck/json2c - Convert JSON to C data literals.BSD 3-Clause
quartzjer/js0n - Flexible Zero-Footprint JSON Parser in C.Unlicense
sheredom/json.h - JSON parser for C and C++.Unlicense
vincenthz/libjson - JSON parser and printer library in C. Easy tointegrate with any model.License
udp/json-parser - Very low footprint JSON parser written inportable ANSI.License
garnetius/jsong - Faster than light streaming JSON & USON parserand writer with rich and trivial to use API plus SSE optimizations.BSD 2-Clause
recp/json - Parses JSON files into DOM-like data structures.MIT
mjansson/json - Single header JSON/SJSON parser.Unlicense

╠════ INI

`^` INI

ndevilla/iniparser - Parser for .ini files.MIT
madmurphy/libconfini - Yet another INI parser.GPL 3
benhoyt/inih - Simple .INI file parser in C, good for embeddedsystems.License
LloydLabs/librini - Tiny, non-libc dependant, .ini file parserprogrammed from scratch in C99.MIT
compuphase/minIni - A small and portable INI file library withread/write support.Apache 2

╠════ Markdown

`^` Markdown

hoedown/hoedown - Fully standards-compliant, extension-supporting,UTF-8 aware, fast Markdown parser.ISC
commonmark/cmark - Library for parsing the CommonMark dialect ofMarkdown.License
Orc/discount- My C implementation of John Gruber's Markdown markuplanguage.License
commonsguy/cwac-anddown - CWAC AndDown: Markdown Utility Library.Apache 2
fletcher/MultiMarkdown-6 - Lightweight markup processor to produceHTML, LaTeX, and more.License
jgm/peg-markdown - An implementation of markdown in C, using aPEG grammar.Licenses
vmg/sundown - Standards compliant, fast, secure markdown processinglibrary in C.License

╠════ XML

`^` XML

libexpat/libexpat - Stream-oriented XML parser.License
libxml2 - Standards-compliant, portable XML parser.MIT
michaelrsweet/mxml - Small XML reading and writing library.No dependencies aside from C standard library.Apache 2
ooxi/xml.c - Simple XML subset parser comparable to glib's Markupparser.License
bakulf/libmrss - C library for parsing, writing and creating RSSfiles or streams.LGPL 2.1
mmuszkow/librss - RSS and ATOM parsing library.No license
bakulf/libnxml - Library for parsing, writing and creating XML 1.0and 1.1 documents.LGPL 2.1
anton/rss_aggregator - Feed reader lib written in C with use oflibxml2 and utlist.No license

╚════ Other Filetypes

`^` Other Filetypes

yaml/libyaml - Canonical source repository for LibYAML.MIT
mongodb/libbson - BSON utility library.Apache 2
martinh/libconfuse - Small configuration file parser library.ISC
vstakhov/libucl - Universal configuration library parser.BSD 2-Clause
Juniper/libxo - Allows an application to generate plain text, XML,JSON and HTML output using a common set of function calls. The applicationdecides at runtime what output style should be produced.BSD 2-Clause
brechtsanders/xlsxio - Cross-platform library for reading andwriting .xlsx files.MIT
arrbee/diff-match-patch-c - C language port ofgoogle-diff-match-patch library.License
hyperrealm/libconfig - C/C++ library for processing configurationfiles.LGPL 2.1
jedwing/CHMLib - Library for reading Microsoft ITSS/CHM formatfiles.LGPL 2.1
jmcnamara/libxlsxwriter - A C library for creatingExcel XLSX files.License
libharu/libharu - Free PDF library.Zlib
samtools/htslib - C library for high-throughput sequencing dataformats.License
vmg/houdini - API for escaping text for the web.MIT
trumpowen/MegaMimes - A C mime type libraryMIT

Flow Control and Language Extension

`^` Flow Control and Language Extension

orangeduck/Cello - Library introducing higher-levelprogramming to C.BSD 2-Clause
Ragel - DSL for state machines that compiles to C.License
kitsune-dsu/kitsune-core - Efficient, general-purpose framework fordynamic software updating.License
P99 - Suite of macros to implement advanced features like defaultfunction arguments, scope-bound resources, etc.License
CObjectSystem/COS - C Object System.Apache 2
H2CO3/Sparkling - Lightweight extension language.BSD 2-Clause
lua/lua - Embeddable scripting programming language.License
Zeex/subhook - Simple hooking library for C/C++(x86 only, 32/64-bit, no dependencies).BSD 2-Clause
arnaudbrejeon/cspec - Behavior driven development in C.GPL 3
comex/substitute - A free runtime modification library.License
elua/elua - Highly portable version of Lua.License
eudoxia0/magma - Extending C with cmacro.License
graphitemaster/lambdapp - Anonymous functions in C.Unlicense
guillermocalvo/exceptions4c - Exception handling framework for C.LGPL 3
orangeduck/LuaAutoC - Automagically use C Functions and Structswith the Lua API.License
pfultz2/Cloak - A mini-preprocessor library to demostrate therecursive capabilites of the preprocessor.Boost
skeeto/interactive-c-demo - Demonstration of interactiveC programming.Unlicense
symisc/PH7 - An Embedded Implementation of PHP (C Library).License
yasm/yasm - Provides libyasm - embeddable YASM engine.License
zserge/partcl - Micro Tcl implementation.MIT
cesanta/mjs - Embedded JavaScript engine for C/C++.License
graphitemaster/incbin - Include binary files in C/C++.Unlicense
pkrumins/bithacks.h - bithacks.h is a C header file containinguseful bit manipulation macros.MIT
breckinloggins/ngtemplate - A template engine written in C designedto be syntax-compatible with Google CTemplate.MIT
ccxvii/mujs - An embeddable Javascript interpreter in C.ISC
Microsoft/checkedc - Extension to C that adds checking to detect orprevent common programming errors such as buffer overruns and out-of-boundsmemory accesses.MIT
hexspeakerg/ONLY_ONCE - ONLY_ONCE macro makes it so that the blockof code is only run once across threads.MIT
SanderMertens/flecs - An Entity Component System with a dashboard.MIT
akeep/scheme-to-c - A small nanopass compiler from a subset ofScheme to C.MIT
takanuva/ANSI-ISO-C-Exception-Handling - Exceptions in C.LGPL 3
small-c/obj.h - A single-header support for OOP in pure C.MIT
Hirrolot/poica - Features of modern programming languages in plainC11 implemented via macro system.MIT

Game Development

Engines, libraries and other helpful things specifically for making games.

╠════ Game Engines

`^` Game Engines

xonotic/darkplaces - Modified version of the Quake2 engine.GPL 2
ioquake/ioq3 - The Quake3 engine, freed at last.GPL 2
orx/orx - Portable, lightweight, plugin-based, data-driven,2D-oriented game engine.License
zturtleman/spearmint - Engine designed for FPS games.GPL 3
Gigoteur/UnicornConsole - Unicorn Console: create quick game!MIT
MarilynDafa/Bulllord-Engine - lightspeed lightweight elegant gameengine in pure c.MIT
HerculesWS/Hercules - Creation of a robust massively multiplayeronline role playing game (MMORPG) server package.GPL 3
Olde-Skuul/doom3do - The complete archive for DOOM for the 3DO.MIT
RandyGaul/AsciiEngine - Game engine written in C to create Asciiart games within the Windows console.MIT
littlewolf - The tiny software graphics and game engine.MIT
eduard-permyakov/permafrost-engine - An OpenGL 3.3 RTS game enginewritten in C.GPL 3
ejoy/ejoy2d - A 2D Graphics Engine for Mobile Game.MIT
etlegacy/etlegacy - ET: Legacy is based on the source code of theWolfenstein: Enemy Territory which was released under the GPLv3 license.GPL 3
fabiensanglard/chocolate_duke3D - chocolate Duke Nukem 3D.License
a-nikolaev/curseofwar - A Real Time Strategy game for Linux.GPL 3
chocolate-doom/chocolate-doom - Chocolate Doom is a Doom sourceport that is minimalist and historically accurate.GPL 2
cxong/cdogs-sdl - Classic overhead run-and-gun game.GPL 2
fogleman/Craft - A simple Minecraft clone written in C using modernOpenGL (shaders).MIT
id-Software/DOOM - DOOM Open Source Release.License
id-Software/Quake-2 - Quake 2 GPL Source Release.GPL 2
id-Software/Quake-III-Arena - Quake III Arena GPL Source Release.GPL 2
id-Software/Quake - Quake GPL Source Release.GPL 2
keendreams/keen - Keen Dreams on Greenlight!GPL 2
linleyh/liberation-circuit - Trapped in a hostile computer system,you must make a way out - RTS/coding game.GPL 3
martincohen/Punity - A tiny game engine in C.MIT
orangeduck/Corange - Pure C Game Engine.License
naev/naev - Naev is a 2d action/rpg space game that combineselements from the action, rpg and simulation genres.GPL 3
nikki93/cgame - some ideas involving games and C.No license
scottcgi/Mojoc - A cross-platform, open-source, pure C game enginefor mobile game.MIT
septag/darkhammer - darkHAMMER is a lightweight, open-source,multiplatform game engine. written in C (C99) language, supports pythonand C# bindings and lua scripts.License
taylor001/crown - The flexible game engine.MIT
theunamedguy/market-sim - A retro stock-trading game utilizinglive market data.GPL 2
tpoindex/crobots - CROBOTS is a programming game, for programmers(or aspiring programmers).GPL 2
andwn/cave-story-md - A fan port of Cave Story for theSega Mega Drive.License
angband/angband - A free, single-player roguelike dungeonexploration game.License
nesbox/tic.computer - Public TIC-80 issues tracker.MIT
cschied/q2vkpt - Real-time path tracer VKPT integrated into q2proQuake 2 client.GPL 2
ec-/Quake3e - Improved Quake III Arena engine.GPL 2
skullernet/q2pro - Enhanced Quake 2 client and server focused onmultiplayer.GPL 2
jdolan/quake2 - Classic Quake II for Mac and Linux.GPL 2
nothings/obbg - Block/voxel-based game.Public domain
bvschaik/julius - An open source re-implementation of Caesar III.AGPL 3
simple2d/simple2d - Simple, open-source 2D graphics for everyone.MIT
exezin/exengine - A C99 3D game engine.MIT
NightDiveStudios/shockmac - System Shock (PowerMac version OfficialGPL Release).GPL 3
blinry/gish - Open Source version of the award-winning physicsplatformer.Licenses
ambethia/aposelene - Experimental 2D Engine in C.MIT
klaussilveira/qengine - Retro game engine for developers that enjoycreating games like it's 1997.GPL 2
sebbekarlsson/coelum - Game engine for 2d and 3d written in C.GPL 3
bjornbytes/lovr - Virtual Reality Engine.MIT
EvilPudding/candle - Game engine based on GLEW and SDL.MIT
zauonlok/renderer - Shader-based software renderer in C89 withminimal dependencies.MIT
cdev-tux/q3lite - Quake 3 engine rendered in OpenGL ES.GPL 3
kondrak/vkQuake2 - Vulkan Quake 2 implementation.LGPL 2

╠════ Graphics Rendering

`^` Graphics Rendering

Everything related to video rendering only. Also visitawesome-opengl andawesome-vulkan.

grimfang4/sdl-gpu - Library for high-performance, modern 2Dgraphics. Based on SDL.MIT
dcnieho/FreeGLUT - Alternative to the OpenGL Utility Toolkit. Allowsthe creation and management of windows with OpenGL contexts.License
MauriceGit/Cloth_Simulation - Cloth-Visualization viaparticle-simulation.ISC
MauriceGit/Partikel_accelleration_on_GPU - Particle accellerationwith OpenGL 4.3, using the compute shader to calculate particle movement ongraphics hardware.ISC
ands/lightmapper - A C/C++ single-file library for drop-in lightmapbaking. Just use your existing OpenGL renderer to bounce light!Public domain
ands/seamoptimizer - A C/C++ single-file library that minimizes thehard transition errors of disjoint edges in lightmaps.Public domain
ebassi/graphene - A thin layer of graphic data types.MIT
cacalabs/libcaca - ASCII renderer for terminal-based interfaces.WTFPL
OpenGL - Industry adopted 2D and 3D graphics API.Graphics API
OpenGL ES - Industry adopted 2D and 3D graphics API for mobile andembedded devices.Graphics API
OpenGL SC - Graphic and compute standard for industry requiringsystem safety certification.Graphics API
Vulkan - Explicit graphic and compute API for modern cross-platformdevelopment.Graphics API
Cairo -2D graphics library.Licenses
Cogl - GPU graphics and utilities API.License
glfw/glfw - A multi-platform library for OpenGL, OpenGL ES, Vulkan,window and input.Zlib
nigels-com/glew - The OpenGL Extension Wrangler Library.License
anoek/ex-sdl-cairo-freetype-harfbuzz - Example code which uses SDL,cairo, freetype, and harfbuzz to do ttf/otf text layout and rendering.No license
ashima/webgl-noise - Procedural Noise Shader Routines compatiblewith WebGL.MIT
grz0zrg/fbg - Lightweight C 2D graphics API agnostic library withparallelism support.BSD 3-Clause
ileben/ShivaVG - OpenGL based ANSI C implementation of the OpenVGstandard.LGPL 2.1
jpbruyere/vkvg - Vulkan vector drawing, try to stay close tocairo api.MIT
memononen/nanovg - Antialiased 2D vector drawing library on top ofOpenGL for UI and visualizations.Zlib
micahpearlman/MonkVG - OpenVG 1.1 like vector graphics APIimplementation optimized for game use currently using an OpenGL ES backendthat should be compatible with any HW that supports OpenGL ES 2.0 whichincludes most iOS and Android devices.License
minusinf/opengl_dataviewer - A simple OpenGL xyzw dataviewer.GPL 3
rougier/freetype-gl - OpenGL text using one vertex buffer, onetexture and FreeType.License
simple2d/simple2d - Simple, open-source 2D graphics for everyone.MIT
jakogut/tinyflock - A simple, high-performance, threaded, andinteractive flocking demo written in C with GLFW.No license
anholt/libepoxy - Library for handling OpenGL function pointermanagement.License
felselva/gfw - Pure C Minimal Graphics Framework (OpenGL).Zlib
karimnaaji/voxelizer - Header only mesh voxelizer in c99.MIT
kbernholm/leloup - All the C functions needed for drawingsolid 3D vector graphics.MIT
dr-soft/glbind - Single file OpenGL API loader.Licenses
dr-soft/vkbind - Single file Vulkan API loader.Licenses
dr-soft/minidraw - Single file 2D graphics library written in C.Licenses
glouw/gel - N64-like software renderer.MIT

╚════ Gamedev Helping Libraries

`^` Gamedev Helping Libraries

sigil - Sound, Input and Graphics Integration Library; a simplealternative to other libraries for doing all those things. Various licenses,all open source.Licenses
SFML/CSFML - Binding for SFML in C.License
SDL - Cross-platform development library designed to providelow-level access to audio, keyboard, mouse, joystick and graphics hardware viaOpenGL. SDL2 is the most current version.Zlib
HBehrens/obj2opengl - script to convert 3D models of OBJ files toC/C++ float arrays (vertices, faces, texture) compatible with OpenGL ESglDrawArrays compatible with iPhone/iPad.GPL 3
Kazade/kazmath - A C math library targeted at games.BSD 2-Clause
R4stl1n/cAudio - 3D Audio Engine Based on Openal.Zlib
Tangent128/luasdl2 - A pure C binding of SDL 2.0 for Lua 5.1,Lua 5.2, and LuaJIT.ISC
ccore/ccore_rewrite - A cross platform low level game developmentlibrary.BSD 3-Clause
cloudwu/skynet - A lightweight online game framework.MIT
felselva/mathc - Pure C math library for 2D and 3D programming.Zlib
gabomdq/SDL_GameControllerDB - A community sourced database of gamecontroller mappings to be used with SDL2 Game Controller functionality.License
geon/gloss - A bidirectional path tracer written in C.MIT
jarikomppa/soloud - Free, easy, portable audio engine for games.License
liballeg/allegro5 - The official Allegro 5 git repository.License
recp/cglm - Highly Optimized Graphics Math (glm) for C.MIT
raysan5/raylib - A simple and easy-to-use library to enjoyvideogames programming.Zlib
rxi/lovedos - A framework for making 2D DOS games in Lua.MIT
slembcke/Chipmunk2D - A fast and lightweight 2D game physicslibrary.MIT
shaunlebron/blinky - Exploring peripheral vision in games(using Quake).MIT
nem0/OpenFBX - Lightweight open source FBX importer.MIT
librg/librg - Library for building simple and elegantcross-platform mmo client-server solutions.Apache 2
Srekel/phyxed-2d - 2d physics engine with fixed-point support.Licenses
recp/AssetKit - 3D asset importer/exporter/util library based onCOLLADA/glTF specs.MIT
olofson/audiality2 - A realtime scripted modular audio engine forvideo games and musical applications.Zlib
dr-soft/miniobj - Simple library for loading OBJ mesh files.Public Domain
dr-soft/mintaro - Framework for making simple, retro style games.Public Domain
SasLuca/rayfork - raylib fork introducing some changes.No license
jkuhlmann/cgltf - Single-file glTF 2.0 loader/writer in C99.MIT

Geography

`^` Geography

Geodata, street maps, navigation and so on

Unidata/gempak - Analysis, display, and product generation packagefor meteorological data.BSD 3-Clause
evanmiller/ProjCL - Crazy-fast map projections and geodesiccalculations.License
olofsj/GLMap - An OpenGL ES 2.0 renderer for Openstreetmap data.LGPL 3
olofsj/Whichway - C library for flexible (bike, foot, car) routingin road networks from Openstreetmap data.No license
maxmind/geoip-api-c - GeoIP Legacy C API.License
navit-gps/navit - The open source (GPL v2) turn-by-turn navigationsoftware for many OS.License
lionsoul2014/ip2region - Offline IP location library with accuracyrate of 99.9% and 0.0x millseconds searching performance. DB file is less then5Mb with all ip address stored. binding for Java, PHP, C, Python, Nodejs,Golang, C#, lua. Binary, B-tree, Memory searching algorithm.Apache 2
openvenues/libpostal - A C library for parsing/normalizing streetaddresses around the world. Powered by statistical NLP and open geo data.MIT
propublica/simple-tiles - Simple tile generation for maps.MIT
simplegeo/libgeohash - A pure C implementation of the Geohashalgorithm.BSD 3-Clause
kosma/minmea - Lightweight GPS NMEA 0183 parser library in pure C.WTFPL
geocommons/geocoder - Modular Street Address Geocoder.LGPL 3
bauerca/gridfloat - Slice and dice USGS elevation data from thecommand line.MIT

GUI

`^` GUI

tinyfiledialogs - Single-file library for simple dialogs. Compatiblewith many other toolkits and OSes.Zlib
vurtun/nuklear - A single-header ANSI C gui library.Licenses
andlabs/libui - Simple and portable (but not inflexible) GUI libraryin C that uses the native GUI technologies of each platform it supports.License
lc-soft/LCUI - A small C library for building user interfaces withC, XML and CSS.MIT
littlevgl/lvgl - Graphics library to create an embedded GUI witheasy-to-use graphical elements, beautiful visual effects and low memoryfootprint. It offers anti-aliasing, opacity, and animations using only oneframe buffer.MIT
ocornut/imgui_club - Nice things to use along dear imgui.No license
GTK+ - Cross-platform widget toolkit.License
IUP - Another cross-platform widget toolkit.License
Tk - Basic widget toolkit. Part of Tcl/Tk.License
XForms Toolkit - Widget toolkit designed for the XWindow system.LGPL 2.1
Clutter - UI library based on OpenGL.LGPL 2.1
randrew/layout - Single-file library for calculating 2D UI layoutsusing stacking boxes. Compiles as C99 or C++.License
cimgui/cimgui - c-api for imgui.MIT
elvismt/slope - A library to create charts from raw data usingcairo. Can be shown in GtkDrawingAreaLGPL 3
DeXP/nuklear_cross - Nuklear+ (read as "Nuklear cross") is afront-end overlay for Nuklear GUI library.Licenses
xkbcommon/libxkbcommon - Keymap handling library for toolkits andwindow systems.License
raysan5/raygui - Immediate GUI library from raylib author.Zlib
rxi/microui - Immediate-mode UI ANSI C library.MIT
VincentWei/minigui - Crossplatform windowing and GUI librarytargeted for embed usage.GPL 3
achimdoebler/UGUI - Graphic library for embedded systems.License

Hardware Oriented

`^` Hardware Oriented

obgm/libcoap - Implementation of the Constrained ApplicationProtocol.License
Genymobile/scrcpy - Display and control your Android device.Apache 2
Azure/azure-iot-sdk-c - A C99 SDK for connecting devices toMicrosoft Azure IoT services.MIT
FoxelSA/libfastcal - Fast calibration data access.AGPL 3
Stephane-D/SGDK - SGDK: A small, open and free development kit forthe Sega Megadrive.MIT
andygock/avr-uart - AVR UART C Library.License
anrieff/libcpuid - a small C library for x86 CPU detection andfeature extraction.BSD 2-Clause
coocox/cox - CoX is an peripherals library with a unified standardinterface specially for ARM Cortex M.BSD 3-Clause
edorfaus/TEMPered - C library and program for reading the TEMPerfamily of thermometer and hygrometer devices.BSD 2-Clause
google/cpu_features - A cross platform C99 library to get cpufeatures at runtime.Apache 2
jackmitch/libsoc - C library for interfacing with common SoCperipherals through generic kernel interfaces.LGPL 2.1
joan2937/pigpio - C library for the Raspberry which allows controlof the General Purpose Input Outputs (GPIO).Unlicense
libimobiledevice/libimobiledevice - A cross-platform protocollibrary to communicate with iOS devices.LGPL 2.1
libopencm3/libopencm3 - Open Source ARM cortex m microcontrollerlibrary.GPL 3
libusb/libusb - A cross-platform library to access USB devices.LGPL 2.1
micronucleus/micronucleus - ATTiny usb bootloader with a strongemphasis on bootloader compactness.License
nfc-tools/libnfc - Platform independent Near Field Communicationlibrary.LGPL 3
signal11/hidapi - A Simple library for communicating with USB andBluetooth HID devices on Linux, Mac, and Windows.Licenses
wiiudev/libwiiu - Build system and examples for running C codeon the Wii U.No license
floooh/chips - 8-bit chip and system emulators in standaloneC headers.Zlib
rofl0r/endianness.h - Endianness detection and conversion.Licenses

Hashing

`^` Hashing

Hash function implementations for non-cryptographic purposes.

centaurean/spookyhash - Fast hash function.BSD 3-Clause
leo-yuriev/t1ha - Fast Positive Hash - a portable, fast hashfunction.BSD 3-Clause
Cyan4973/xxHash - Extremely fast non-cryptographic hash algorithm.BSD 2-Clause
PeterScott/murmur3 - Murmur3 hash in C.Public domain
RJ/ketama - C library for consistent hashing, and langauge bindings.BSD 2-Clause
cr-marcstevens/sha1collisiondetection - Library and command linetool to detect SHA-1 collision in a file.MIT
clibs/hash - C hash implementation based on khash.MIT
lemire/clhash - C library implementing fast CLHash function.Apache 2
mattsta/crcspeed - This make CRC be fast. Included implementations:CRC-64-Jones and CRC-16-CCITT.BSD 3-Clause
plashchynski/str2hex - Data formats convertion utility.Apache 2
tzvetkoff/hashids.c - Port of the Hashids library.MIT

Image Processing and Computer Vision

`^` Image Processing and Computer Vision

libgd/libgd - Library for the dynamic creation of images byprogrammers.License
giflib - Library for reading and writing gif images.License
libjpeg-turbo/libjpeg-turbo - Faster library for reading andwriting JPEG files.Licenses
libpng - The official PNG reference library.License
liuliu/ccv - C-based/Cached/Core Computer Vision Library, A ModernComputer Vision Library.License
Phildo/pixQL - SQL for image processing.No license
XadillaX/byakuren - A theme color extracting library.MIT
ansilove/ansilove - ANSi / ASCII art to PNG converter.BSD 2-Clause
bluesmoon/pngtocss - Read in a gradient from a png file and spitout CSS for it.BSD
brendangregg/Dump2PNG - Visualize file data as a PNG.License
buaazp/zimg - A lightweight and high performance image storage andprocessing system.BSD 3-Clause
dbohdan/s2png - Store data of any kind inside PNG images.GPL 2
ginsweater/gif-h - Simple C++ one-header library for the creationof animated GIFs from image data.Unlicense
libvips/libvips - A fast image processing library with low memoryneeds.LGPL 2.1
mozilla/mozjpeg - Improved JPEG encoder.Licenses
openslide/openslide - C library for reading virtual slide images.License
pornel/giflossy - Lossy GIF compressor.GPL 2
pornel/pngquant - Lossy PNG compressor.License
rflynn/imgmin - Lossy image optimization.MIT
uclouvain/openjpeg - Official repository of the OpenJPEG project.BSD 2-Clause
vlfeat/vlfeat - An open library of computer vision algorithms.BSD 2-Clause
libspng - Secure PNG reading/writing.BSD 2-Clause
ImageMagick/ImageMagick - Image processing suite with C interface.License
saitoha/libsixel - Library implementing the SIXEL protocol,allowing beautiful graphics in your terminal.License
jedisct1/libpuzzle - A library to quickly find visually similarimages.ISC
mattes/epeg - Fast JPEG/ JPG thumbnail scaling with the minimumfuss and CPU overhead. It makes use of libjpeg features of being able to loadan image by only decoding the DCT coefficients needed to reconstruct an imageof the size desired.License
dr-soft/dr_pcx - Single file PCX image loader.Public Domain
cbraudo/qdbmp - Cross-platform C library for handling BMP files.MIT
lecram/gifdec - GIF decoder.Public Domain
gfxprim/gfxprim - Library for processing and drawing images invariety of formats.LGPL 2.1

Integrated Debugging and Logging

`^` Integrated Debugging and Logging

gpakosz/whereami - One-file library for locating the currentexecutable on the file system.MIT
HardySimpson/zlog - Reliable, pure C logging library.LGPL 2.1
esneider/debug - One-header library for easier 'printf debugging'.MIT
ThrowTheSwitch/CException - Implementation of exceptions.License
google/pblog - Small, low overhead, structured logging libraryintended for logging formware events.Apache 2
0xmalloc/c-log - a fast ,stable and thread-safe log lib(logger)for C/C++ language.Apache 2
Celtoys/Remotery - Single C file, Realtime CPU/GPU Profiler withRemote Web Viewer.Apache 2
armink/EasyLogger - A ultra-lightweight(ROM<1.6K, RAM<0.3k),high-performance C/C++ log library.MIT
cyrus-and/prof - Self-contained C/C++ profiler library for Linux.License
facebook/liblogfaf - A library that logs messages usingnon-blocking UDP datagrams.BSD 3-Clause
kmcallister/embedded-breakpoints - Embed GDB breakpoints in Csource code.BSD 3-Clause
ntpeters/SimpleLogger - Basic logger for C and C++ projects.MIT
openjudge/sandbox - Open-source suite of software components forC/C++ and Python developers to create automated profiling tools and watchdogprograms.BSD 3-Clause
rxi/log.c - A simple logging library implemented in C99.MIT
yosefk/checkedthreads - checkedthreads: no race condition goesunnoticed! Simple API, automatic load balancing, Valgrind-based checking.BSD 2-Clause
libFirm - Library that provides a graph-based intermediaterepresentation, optimizations and assembly code generation suitable for use incompilers. Comes with an example C front-end under the same license.GPL 2
daddinuz/watchdog - Memory tracer, leaks hunter.MIT
okuvshynov/b63 - Lightweight benchmarking tool for C.Apache 2
stephenrkell/trap-syscalls - Monitor, rewrite and/or otherwise trapsystem calls.Licenses
immunityinc/libptrace - An event driven multi-core processdebugging, tracing, and manipulation framework.LGPL 2.1

I/O

`^` I/O

Lajnold/falloc - falloc creates files of a user-specified size. Ituses the posix_fallocate syscall for allocating the right size directly,instead of copying data like the commonly used dd tool does.GPL 3
cgaebel/pipe - A simple thread-safe FIFO in C.MIT
cxong/tinydir - Lightweight, portable and easy to integrate Cdirectory and file reader.License
reverbrain/eblob - Eblob is an append-only low-level IO library,which saves data in blob files. Created as low-level backend for elliptics.LGPL 3
tronkko/dirent - C/C++ library for retrieving information on filesand directories.MIT
jwerle/fs.c - File system API much like Node's fs module.MIT
zevv/duc - Library and suite of tools for inspecting disk usage.LGPL 3
kwhat/libuiohook - A multi-platform C library to provide globalkeyboard and mouse hooks from userland.GPL 3
dr-soft/dr_fs - Single file libraries for working with filesystem.Public Domain
mpaland/printf - Standalone printf, sprintf and (v)snprintfimplementation.MIT

Lexing and Parsing

`^` Lexing and Parsing

GNU Bison - General-purpose parser generator that converts anannotated context-free grammar into a range of parsers.GPL 3
bbu/simple-interpreter - A hackable and extensible lexer, parserand interpreter for a minimalistic, imperative, C-like language.No license
dcreager/libpush - An arrow-based parser combinator library for C.BSD 3-Clause
kmussel/Moment - Natural Language Date Parser Using Lex/Yacc/C.MIT
skvadrik/re2c - lexer generator for C/C++.License
westes/flex - The Fast Lexical Analyzer - scanner generator forlexing in C and C++.License
orangeduck/mpc - Parser combinator library.BSD 2-Clause
transceptor-technology/libcleri - Libcleri is a powerful tool tobuild languages. From a built language, libcleri can automatically createparse trees, which are data structures representing how a grammar matchesinput. It also provides feedback in case the input does not match thelanguage. This can be useful for auto-completion, suggestions or errorhandling.MIT
dr-soft/url - URL parsing in C.BSD 2-Clause

Memory Management

`^` Memory Management

Boehm GC - Garbage collection for C. Various licenses, all opensource.License
Lockless Memory Allocator - Efficient memory allocator.GPL 3
talloc - Hierarchical, reference-counted memory pool system withdestructors.LGPL 3
mattconte/tlsf - Two-Level Segregated Fit allocator; ageneral-purpose, dynamic memory allocator designed to meet real-timerequirements.BSD 3-Clause
jemalloc/jemalloc - General purpose malloc(3) implementation thatemphasizes fragmentation avoidance and scalable concurrency support, commonlyused in production systems.License
dlmalloc - Doug Lea's malloc(3) implementation, useful for academicand research purposes.Public domain
CCareaga/heap_allocator - A simple heap memory allocator in~200 lines.MIT
ivmai/bdwgc - The Boehm-Demers-Weiser conservative C/C++ GarbageCollector (libgc, bdwgc, boehm-gc).License
mulle-nat/mulle-allocator - Flexible C memory allocation schemewith leak checking.BSD 3-Clause
munificent/mark-sweep - A simple mark-sweep garbage collector in C.MIT
ned14/nedmalloc - Fast portable thread caching mallocimplementation written in C for multiple threads without lock contention basedon dlmalloc. Optimised for x86 and x64. Compatible with C++. Can patch itselfinto existing binaries on Windows.Boost
orangeduck/tgc - A Tiny Garbage Collector for C.BSD 2-Clause
rampantpixels/rpmalloc - Public domain cross platform lock freethread caching 32-byte aligned memory allocator implemented in C.License
stevedekorte/garbagecollector - Incrementall garbage collectorlibrary in C for use by high level language implementions.BSD 3-Clause
Simon-Swenson-8351/tralloc - A binary tree based memory allocator.BSD 3-Clause
Qqwy/raii_with - A simple library to provide RAII instandard-compliant C99.MIT
emeryberger/Malloc-Implementations - A collection of memoryallocators.No license
microsoft/mimalloc - Compact general purpose allocator by Microsoft.MIT
mjansson/rpmalloc - Cross platform lock free thread caching 16-bytealigned memory allocator.License
yvan-sraka/malloc - malloc implementation with reduced dependencies.GPL 3
AlxHnr/CRegion - Region-based memory management library.License

Multimedia

`^` Multimedia

Audio and video processing.

jeremyevans/ape_tag_libs - Library for working with APEv2 tags.MIT
lieff/minimp3 - Lightweight MP3 decoder single header library.License
FFMPEG - Complete, cross-platform solution to record, convert andstream audio and video.LGPL 2.1
GStreamer - Framework for audio and visual media.LGPL 2
mpv-player/mpv - Media player MPV with provided library libmpv.Compile with./waf configure --disable-cplayer --enable-libmpv-shared tonot have the music player.License
andrewrk/libsoundio - Library for cross-platform, real-time audioinput and output. Has a range of back-ends.MIT
AVbin/AVbin - Thin, cross-platform wrapper around Libav’svideo- and audio-decoding functionality, providing long-term binarycompatibility for applications and languages that need it.LGPL 3
PaulBatchelor/Soundpipe - A lightweight music DSP library.MIT
Themaister/libfmsynth - A C library which implements an FMsynthesizer.MIT
UniversalPrimer/flv-analyzer - Loads an FLV file into sane C datastructures and outputs fields as human readable.GPL 3
Vidvox/hap-qt-codec - A QuickTime codec for Hap video.License
acrisci/playerctl - mpris command-line controller and library forspotify, vlc, audacious, bmp, cmus, and others.LGPL 3
aubio/aubio - a library for audio and music analysis.GPL 3
cmatsuoka/libxmp - Libxmp is a library that renders module files toPCM data.License
cnlohr/colorchord - Chromatic Sound to Light Conversion System.BSD 3-Clause
csound/csound - A sound and music computing system.LGPL 2.1
dxjia/ffmpeg-commands-executor-library - execute ffmpeg commandsthrough a jni shared library.Apache 2
erikd/libsndfile - A C library for reading and writing sound filescontaining sampled audio data.LGPL 2.1
kfish/libfishsound - A simple programming interface for decodingand encoding audio data using Xiph.org codecs (FLAC, Speex and Vorbis).BSD 3-Clause
libass/libass - libass is a portable subtitle renderer for theASS/SSA (Advanced Substation Alpha/Substation Alpha) subtitle format.ISC
libav/libav - Collection of libraries and tools to processmultimedia content such as audio, video, subtitles and related metadata.License
mltframework/mlt - MLT Multimedia Framework.LGPL 2.1
sahib/glyr - Glyr is a music related metadata searchengine, bothwith commandline interface and C API.LGPL 3
simonyiszk/csdr - A simple DSP library and command-line tool forSoftware Defined Radio.License
xiph/flac - Free Lossless Audio Codec.License
xiph/opus - Modern audio compression for the internet.License
mhroth/tinyosc - A minimal Open Sound Control (OSC) library writtenin vanilla C.ISC
libao - Cross-platform audio library with a wide variety ofoutputs.GPL 2
libvlc - VLC player library.Licenses
raysan5/raudio - A simple and easy-to-use audio library based onminiaudio.Zlib
dr-soft/miniaudio - Single file audio playback and capturelibrary written in C.Licenses

Multiple Purpose Libraries

`^` Multiple Purpose Libraries

parallella/pal - Optimized library for maths, parallel processingand data movement.Apache 2
APR - Apache Portable Runtime; another library of cross-platformutility functions.Apache 2
GLib - Library of utility functions and structures, designed to beportable, efficient and powerful.LGPL 2.1
keybuk/libnih - Lightweight library of C functions and structures.GPL 2
wolkykim/qlibc - Simple and powerful C library, designed as areplacement for GLib while focusing on being small and light.License
chutsu/cog - C common library containing common data structures,sorting algorithms and utility functions.MIT
cs50/libcs50 - CS50 Library for C.MIT
dcreager/libcork - A simple, easily embeddable cross-platform Clibrary.BSD 3-Clause
faragon/libsrt - C library for writing fast and safe C code,faster. It provides string, vector, bit set, set, map, hash set, and hash maphandling. Suitable for soft and hard real-time. Allows both heap and stackallocation.BSD 3-Clause
koanlogic/libu - LibU is a multiplatform utility library written inC, with APIs for handling memory allocation, networking and URI parsing,string manipulation, debugging, and logging in a very compact way, plus manyother miscellaneous tasks.License
letoram/arcan - Display Server, Multimedia Framework,Game Engine-> "Desktop Engine".Licenses
saprykin/plibsys - Highly portable C system library: threads andsynchronization primitives, sockets (TCP, UDP, SCTP), IPv4 and IPv6, IPC,hash functions (MD5, SHA-1, SHA-2, SHA-3, GOST), binary trees (RB, AVL) andmore. Native code performance.MIT
tboox/tbox - A glib-like multi-platform c library.Apache 2
zpl-c/zpl - Your C99 Powerkit.Licenses
dmw/caffeine - C Application Framework.LGPL 2.1
breckinloggins/libuseful - A collection of useful data structures,algorithms, and utilities for C programming.MIT
erimatnor/libckit - A kit of C-based utilities and data structures.Apache 2
pforemski/libpjf - A C library of data structures with tools(based on libasn).GPL 3
stevedekorte/basekit - C based OO portable data structure library.BSD 3-Clause
mjansson/foundation_lib - Cross-platform foundation library inC providing basic support data types and functions to write applications andgames in a platform-independent fashion.Unlicense
happyfish100/libfastcommon - Functions including: string, logger,chain, hash, socket, ini file reader, base64 encode / decode,url encode / decode, fast timer, skiplist, object pool etc. detail info pleasesee the c header files.LGPL
sabit/libcprops - C prototyping tools.LGPL 2.1

Networking

╠════ DNS

`^` DNS

GNU adns - Advanced, easy-to-use, asynch-capable DNS client libraryand utilities.GPL 3
ldns - Library to simplify DNS programming.BSD 3-Clause
bagder/c-ares - Library for asynchronous DNS requests.License
farsightsec/dnstable - encoding format, library, and utilities forpassive DNS data.Apache 2
wahern/dns - Single file non-blocking DNS C library withoutcallbacks or external dependencies.MIT
libidn - Implementation of the Stringprep, Punycode and IDNAspecifications.Licenses
mjansson/mdns - mDNS/DNS-SD library.Unlicense

╠════ HTTP

`^` HTTP

nodejs/http-parser - HTTP request/response parser for c.MIT
h2o/picohttpparser - Tiny HTTP parser.MIT
iafonov/multipart-parser-c - Http multipart parser implemented in C.MIT
solusipse/ureq - Micro C library for handling HTTP requests on lowresource systems.MIT
nghttp2/nghttp2 - HTTP/2 C Library.MIT
wg/wrk - Modern HTTP benchmarking tool.License

╠════ Mail

`^` Mail

libquickmail - Library intended to give developers a way to sendemail from their applications. Supports multiple To/Cc/Bcc recipients andattachments without size limits.GPL 3
dinhviethoa/libetpan - Mail Framework for C Language.License
dertuxmalwieder/libvldmail - Your friendly e-mail address validationlibrary.WTFPL

╠════ Messaging and Brokers

`^` Messaging and Brokers

nanomsg/nng - Lightweight brokerless messaging.MIT
alanxz/rabbitmq-c - Client library for RabbitMQ.License
antirez/disque - Disque is a distributed message broker.BSD 3-Clause
circonus-labs/fq - F@#$*&%Q (Message queue that is fast, brokered,in C and gets out of your way).MIT
zeromq/czmq - High-level C binding for ØMQ.License
nanomsg/nanomsg - C-based implementation of ZeroMQ.License
LiamBindle/MQTT-C - MQTT protocol implementation.MIT

╠════ Remote Desktops

`^` Remote Desktops

FreeRDP/FreeRDP - FreeRDP is a free remote desktop protocol libraryand clients.Apache 2
LibVNC/libvncserver - LibVNCServer/LibVNCClient are cross-platformC libraries that allow you to easily implement VNC server or clientfunctionality in your program.GPL 2

╠════ RPC

`^` RPC

hmng/jsonrpc-c - JSON-RPC in C.MIT
lopter/lightsd - A daemon with a JSON-RPC API to control yourlight bulbs.GPL 3
laruence/yar - RPC for C and PHP.License
protobuf-c/protobuf-c-rpc - Using protobuf-c for RPC.License

╠════ TCP, UDP, Sockets

`^` TCP, UDP, Sockets

bovine/datapipe - Network TCP port forwarding.Public domain
sch3m4/libntoh - User-friendly C Library to perform TCP streamsreassembly and IPv4/6 defragmentation.License
tass-belgium/picotcp - PicoTCP is a free TCP/IP stackimplementation.Licenses
opendp/dpdk-odp - Open data plane on dpdk, TCP/IP stack for dpdk.BSD
lsalzman/enet - ENet reliable UDP networking library.MIT
hoxnox/rawsock_recv_example - SOCK_RAW IPPROTO_UDP socket datatransmission example.BSD 3-Clause
silentbicycle/socket99 - C99 wrapper for the BSD sockets API.ISC
fastos/fastsocket - Fastsocket is a highly scalable socket and itsunderlying networking implementation of Linux kernel.GPL 2
sustrik/msg_control - Helper functions for dealing with socketancillary data.MIT

╠════ Web Servers

`^` Web Servers

taf2/libebb - Lightweight high-performance HTTP server libraryfor C.MIT
libhttpd - Library to add basic web server capabilities to anapplication or embedded device.LGPL
libmicrohttpd - Small C library that makes it easy to run an HTTPserver as part of another application.Licenses
risoflora/libsagui - Cross-platform C library which helps to developweb servers or frameworks.LGPL 3
h2o/h2o - Optimized HTTP/1, HTTP/2 high performance server/library.MIT
mongrel2/mongrel2 - The Mongrel2 Web Server Project.BSD 3-Clause
shenfeng/tiny-web-server - a tiny web server in C, for daily use.MIT
zyearn/zaver - Yet another fast and efficient HTTP server.MIT
libsoup - GNOME HTTP client/server library. Uses GObject.LGPL 2
criticalstack/libevhtp - Create extremely-fast and secure embeddedHTTP servers with ease.BSD 3-Clause
civetweb/civetweb - Embedded C/C++ web server.Licenses
lpereira/lwan - Experimental, scalable, high-performance HTTPserver.GPL 2
cesanta/mongoose - Embedded web server for C/C++.License
oneoo/alilua - epoll/kqueue+lua based web server.MIT
haywire/haywire - Haywire is an asynchronous HTTP server frameworkwritten in C that's built using the event loop based libuv platform layer thatnode.js is built on top of.Apache 2
davidmoreno/onion - C library to create simple HTTP servers and WebApplications.Licenses
wolkykim/libasyncd - Embeddable Event-based AsynchronousMessage/HTTP Server library for C/C++.BSD 2-Clause
balde/balde - Microframework for C based on GLib.LGPL 2.1
bitly/simplehttp - A family of libraries and daemons for buildingscalable web infrastructure.MIT
boazsegev/facil.io - Your high performance web application Cframework.MIT
iafonov/cosmonaut - Fast web server & micro framework implementedin C. Just for fun.MIT
riolet/WAFer - WAFer is a C language-based software platform forscalable server-side and networking applications. Think node.js for Cprogrammers.GPL 2
jeremycw/httpserver.h - Single header library for writingnon-blocking HTTP servers in C.MIT
lammertb/libhttp - Crossplatform HTTP and HTTPS library.MIT
zhaojh329/libuhttpd - Fully asynchronous HTTP server library basedon libev and http-parser for embedded Linux.MIT
silgy/silgy - Multipurpose asynchronous web application backendengine.MIT

╠════ Web Service APIs

`^` Web Service APIs

sinemetu1/twitc - Mini library for interacting with the TwitterOAuth API.MIT
dajobe/flickcurl - Flickr C API library.GPL 2
Cotix/cReddit - CLI Reddit client written in C. Includes separatedlibrary.License
HalosGhost/shaman - A small, native C library and utility to fetchweather.GPL 2
PromyLOPh/pianobar - Console-based pandora.com player.License
Yubico/yubico-c-client - Yubico C client library.BSD 2-Clause
adobkin/libcapn - A simple C Library for interact with the ApplePush Notification Service (APNs).MIT
aws/aws-iot-device-sdk-embedded-C - SDK for connecting to AWS IoTfrom a device using embedded C.Apache 2
domsson/libtwirc - Twitch IRC library for Linux.License

╠════ Websockets

`^` Websockets

tatsuhiro-t/wslay - WebSocket library. Implements version 13 of theWebSocket protocol, as described in RFC 6455.MIT
JonnyWhatshisface/libwebsock - Easy-to-use and powerful web socketlibrary.LGPL 3
m8rge/cwebsocket - Lightweight websocket server library.MIT
zhaojh329/libuwsc - A Lightweight and fully asynchronous WebSocketclient C library based on libubox for Embedded Linux.LGPL 2.1
warmcat/libwebsockets - Canonical websocket library.`License
wbudd/RingSocket - Lockless multi-threaded C11 Linux WebSocketserver.MIT
clemenskresser/ezwebsocket - Websocket server library in C.MIT

╚════ Uncategorized Networking

`^` Uncategorized Networking

libcurl - Client-side URL transfer library, supporting a wide rangeof formats.License
oSip - SIP implementation in C without additional dependencies.LGPL
rxi/dyad - Asynchronous networking library.MIT
51Degrees/Device-Detection - Device detection forC / PHP / Perl / Python and Node.js - professionally maintained device data.License
uriparser/uriparser - Strictly RFC 3986-compliant URI parsing andhandling library.BSD 3-Clause
c9s/r3 - High-performance path dispatching library. It compilesyour route paths into a prefix tree (trie). By using the constructed prefixtrie in the start-up time, you may dispatch your routes with efficiency.MIT
versatica/OverSIP- OverSIP: the SIP framework you dreamed about.MIT
libssh2/libssh2 - the SSH library.BSD 3-Clause
rockdaboot/mget - Multithreaded metalink/file/website downloader(like Wget) and C library.LGPL 3
seanmiddleditch/libtelnet - Simple RFC-complient TELNETimplementation as a C library.Public domain
shadeslayer/libnice - Implementation of the IETF's InteractiveConnectivity Establishment (ICE) standard (RFC 5245) and the Session TraversalUtilities for NAT (STUN) standard (RFC 5389).Licenses
udp/lacewing - Cross-platform network I/O library for C/C++.License
verse/verse - Network protocol for real-time sharing betweengraphical applications.Licenses
the-tcpdump-group/libpcap - the LIBpcap interface to various kernelpacket capture mechanism.BSD 3-Clause
the-tcpdump-group/tcpdump - the TCPdump network dissector.BSD 3-Clause
luohaha/CSpider - A scalable and convenient crawler framework.MIT
nitrogenlogic/cliserver - A sample libevent-based network socketserver that presents a simple command line interface to multiple connectingclients.BSD 2-Clause
babelouest/ulfius - Web Framework to build REST APIs, Webservicesor any HTTP endpoint in C language. Can stream large amount of data, integrateJSON data with Jansson, and create websocket services.LGPL 2.1
haiwen/ccnet - Ccnet is a framework for writing networkedapplications in C.GPL 2
it4e/CHL - C Hypertext Library - A library for writing webapplications in C.LGPL 3
jorisvink/kore - An easy to use, scalable and secure webapplication framework for writing web APIs in C.License
monkey/duda - Duda I/O is an event-driven and high performant webservices framework which exposes a friendly C API.Apache 2
zeromq/zyre - Framework for proximity-based peer-to-peerapplications.License
Maxime2/dataparksearch - Open source, feature rich search engine.License
kristapsdz/kcgi - Minimal CGI and FastCGI library for C/C++.ISC

OpenCL

`^` OpenCL

OpenCL, CUDA, OpenMP and other similar APIs.

cf4ocl - The C Framework for OpenCL.LGPL 3
clMathLibraries/clRNG - an OpenCL based software library containingrandom number generation functions.License
tuxfan/ocl-mla - OpenCL Mid-Level Abstractions.License
matze/oclkit - Two-file OpenCL wrapper.GPL 3
emrainey/OpenCL-Environment - A series of utilities aimed at makingOpenCL easier to use.Apache 2

OS Specifics

`^` OS Specifics

symisc/libcox - Library which permits cross-platform system callsand standard utilities across different operating systems.BSD 2-Clause
checkpoint-restore/criu - Checkpoint/Restore In Userspace; asoftware tool (with a C API) for 'freezing' a running application to disk,then restoring it. Targeted for Linux.Licenses
alsa-lib - Userspace library to interact with ALSA.LGPL 2.1
Leandros/WindowsHModular - A modular Windows.h Header.License
a0rtega/pafish - Pafish is a demonstration tool that employs severaltechniques to detect sandboxes and analysis environments in the same way asmalware families do.GPL 3
antirez/linenoise - A small self-contained alternative to readlineand libedit.BSD 2-Clause
fancycode/MemoryModule - Library to load a DLL from memory.License
jimon/osx_app_in_plain_c - A simple showcase how to create a simpleOS X app in plain C without any Objective-C.No license
rvoicilas/inotify-tools - Library and a set of command-lineprograms for Linux providing a simple interface to inotify.GPL 2
tinyalsa/tinyalsa - Tiny library to interface with ALSA in theLinux kernel.BSD 3-Clause
wengkai/ACLLib - A bunch of C functions covers Win32API andprovides simpler API to beginners for programming Windows GUI applications.GPL 3
zardus/preeny - Some helpful preload libraries for pwning stuff.BSD 2-Clause

Procedural Generation

`^` Procedural Generation

prideout/heman - Tiny library of image utilities dealing withheight maps, normal maps, distance fields and the like.MIT
JCash/voronoi - A C implementation for creating 2D voronoi diagrams.MIT
Srekel/the-worldinator - Procedural world generation experiment.Licenses
saxbophone/libsxbp - Experimental generation of 2D spiralling linesbased on input binary data.License
ajxs/pbp - Procedural Block Painter. Experiments in procedural artgeneration.MIT
Tastyep/ProceduralNoise - Useful functions for proceduralgeneration.No license

Processes and IPC

`^` Processes and IPC

D-Bus - Interprocess communications bus.Licenses
bus1/dbus-broker - Linux D-Bus Message Broker.Apache 2
signalapp/libsignal-protocol-c - Signal Protocol C Library.GPL 3
sharvil/flingfd - A tiny library to send file descriptors acrossprocesses.Apache 2
sheredom/process.h - A simple one header solution to launchingprocesses and interacting with them for C and C++.Unlicense
troydhanson/kvspool - A library to support streaming dataapplications.MIT
xroche/coffeecatch - Tiny native POSIX signal catcher (especiallyuseful for JNI code on Android/Dalvik).BSD 2-Clause
samuellab/InterProcess - A compact C library to share data between processes on Windows.GPL 3

Regex and Search

`^` Regex and Search

kkos/oniguruma - Regex library supporting a wide range of encodings,and incorporating many security-oriented fixes.BSD 2-Clause
PCRE - Implementation of regexes identical to that of Perl 5.License
nasciiboy/RecursiveRegexpRaptor-4 - Simple and completeimplementation of regular expressions with its own sintax.GPL 3
laurikari/tre - POSIX-compliant, feature-full regex library.License
cesanta/slre - Super Light Regexp engine for C/C++.License
k-takata/Onigmo - Regular expressions library forked fromOniguruma.License
openresty/sregex - A non-backtracking NFA/DFA-based Perl-compatibleregex engine matching on large data streams.BSD 3-Clause

Serialization

`^` Serialization

dvidelabs/flatcc - FlatBuffers compiler and library.Apache 2
liteserver/binn - Binary serialization format meant to be compact,fast and easy-to-use.Apache 2
jmckaskill/c-capnproto - Implementation of the Cap'n Protoserialization protocol.MIT
apache/avro - Avro data serialization system for several languages,including C.Apache 2
liteserver/netstring-c - Netstring encoder and decoder.Public domain
protobuf-c - Implementation of Google Protocol Buffer in C.License
ErikDubbelboer/c-pack - Simple data packing/unpacking in C.No license
acg/lwpb - Lightweight Protocol Buffers for C and Python.Apache 2
camgunz/cmp - An implementation of the MessagePack serializationformat in C.MIT
cloudwu/pbc - A protocol buffers library for C.MIT
cloudwu/sproto - Yet another protocol library like google protocolbuffers ,but simple and fast.MIT
dryman/opic - Fast serialization framework for C.LGPL 3
google/upb - Small protobuf implementation in C.BSD 3-Clause
greghaynes/Afproto - Serial data framing protocol.License
ludocode/mpack - Encoder/decoder for the MessagePack serializationformat.MIT
nanopb/nanopb - Protocol Buffers with small code size.Zlib
troydhanson/tpl - Small binary serialization library for C.License
clibs/dumpasn1 - Display the contents of ASN.1 encoded data.License
vlm/asn1c - The ASN.1 Compiler.BSD 2-Clause
eerimoq/pbtools - Google protobuf tools.MIT

Source Code Collections

`^` Source Code Collections

DanielGibson/Snippets - Useful code snippets and header-onlylibraries.Public domain
CCAN - Modelled after Perl's CPAN, this is a big collection of Ccode.No license
libdjb - Collection of libraries doing various things.License
BurntSushi/clibs - A smattering of miscellaneous C libraries.Includes sane argument parsing, a thread-safe multi-producer/multi-consumerqueue, and implementation of common data structures (hashmaps, vectors andlinked lists).WTFPL
RandyGaul/cute_headers - Collection of cross-platform one-file C/C++libraries with no dependencies, primarily used for games.Licenses
chadjoan/C-Survival-Kit - A set of useful functions, datastructures, and macros aimed at allowing more expressive and reliable C code.Portability targets are OpenVMS and Linux.Boost
floooh/sokol - Minimal cross-platform standalone C headers.Zlib
gingerBill/gb - Single-file public domain libraries for C & C++.Public domain
gozfree/libraries - Basic libraries all written in c by gozfree,including network, event, config, log, hash, ipc, rpc, mem, and so on.MIT
mackron/dr_libs - A collection of public domain single-filelibraries for C/C++.Public domain
mattiasgustavsson/libs - Single-file public domain libraries forC/C++.Public domain
matteobertozzi/carthage - Pure C Data Structure and Utils.BSD
napsy/libhelper - General functions and data structures for C.BSD 3-Clause
niklasfrykholm/nflibs - A collection of interoperable minimalisticC libraries.`Public domain
nothings/stb - Single-file public domain libraries for C/C++.Licenses
prideout/par - Single-file C libraries from Philip Allan Rideout.MIT
rmitton/rjm - Various single-file C libraries.Public domain
vurtun/mmx - single header libraries for C/C++.No license
yl790/algorithms-and-data-structures - Different algorithms & datastructures.No license
rofl0r/libulz - a collection of useful functions and datastructures to create C apps faster. focus on simplicity, ability to staticallylink and minimal binary size.LGPL 2.1
sdroege/snippets - Some algorithms and data structures.LGPL 3
lbrito1/cstuff - Algorithms & data structures in C.GPL 2
angelortega/mpdm - Minimum Profit Data Manager.Public domain
attractivechaos/klib - Small and lightweight implementations ofcommon algorithms and data structures.MIT
f1nalspace/final_game_tech - Game related libraries.MIT
QwertyQaz414/anv - Collection of header-only utility libraries.MIT

Scientific

`^` Scientific

Math mostly located inCalculations category

GuillaumeHolley/BloomFilterTrie - A data structure for pan-genomestorage.MIT
noporpoise/seq_file - Library for Reading Bioinformatic SequenceData in C.Public domain
r0nk/corvus - Genetic BF programming.No license
XenonofArcticus/DynamicTrack - Access sources of dynamically-updateddata about discrete entities like GPSes, INSes, ADS-B sources.MIT
ericmandel/funtools - A "minimal buy-in" FITS library and utilitypackage for astronomical data analysis.LGPL 2.1

Special Purpose

`^` Special Purpose

Libraries with very narrow non-generic purpose.

TulipCharts/tulipindicators - Library of functions for technicalanalysis of financial data.LGPL 3
MatthewLM/cbitcoin - Low-level bitcoin library written in C.MIT
RhysU/ESIO - Provides simple, high throughput input and output ofstructured data sets using parallel HDF5. ESIO is designed to support readingand writing turbulence simulation restart files within C, C++, and modernFortran applications.LGPL 2.1
Unidata/netcdf-c - Official GitHub repository for netCDF-C librariesand utilities.BSD 3-Clause
jgarzik/picocoin - A bitcoin library in C, SPV wallet & more.License
libtrading/libtrading - Ultra low-latency trading connectivitylibrary for C and C++.BSD 2-Clause
nayuki/QR-Code-generator - High-quality QR Code generator libraryin Java, JavaScript, Python, C++, C.MIT
qiq/Czech-morphology - Czech morphology library, using data filescompatible with PDT 2.0License
sleuthkit/sleuthkit - The Sleuth Kit® (TSK) is a library andcollection of command line digital forensics tools that allow you toinvestigate volume and file system data. The library can be incorporated intolarger digital forensics tools and the command line tools can be directly usedto find evidence.Licenses
hroptatyr/uterus - universal tick encoder library to efficientlytransport huge amounts of tick data.BSD 3-Clause
luke-jr/bfgminer - Modular ASIC/FPGA miner written in C, featuringoverclocking, monitoring, fan speed control and remote interface capabilities.GPL 3

Standard Libraries

`^` Standard Libraries

Implementations of the C standards

PDCLib - The Public Domain C Library. Implements most of C99 andsome of C11.License
uClibc-ng - Small C library for developing embedded systems.LGPL 2.1
dietlibc - C standard library designed for the smallest possiblebinaries.GPL 2
glibc - The GNU C Library; an implementation of the C standardlibrary.Licenses
musl - Standard C library, compatible with POSIX 2008 and C11.Designed for static linking.MIT
NuxiNL/cloudlibc - CloudABI's standard C library.BSD 2-Clause
marssaxman/startc - Minimal freestanding C library for bare-metali386 development.License
olibc/olibc - Another C Library optimized for Embedded Linux.BSD
lpsantil/rt0 - A minimal C runtime for Linux i386 & x86_64.BSD 2-Clause
keith-packard/picolibc - Standard C library APIs that targetssmall embedded systems with limited RAM.Licenses

String Manipulation

`^` String Manipulation

wooorm/levenstein.c - Levenstein distance algorithm implementation.MIT
wooorm/stmr.c - Porter Stemmer algorithm implementation.MIT
websnarf/bstrlib- The Better String Library.BSD 3-Clause
ICU - International Components for Unicode; a library for Unicodesupport.License
libunistring - Library for manipulating Unicode strings in C.Licenses
libgiconv - Text conversion library.LGPL
JuliaStrings/utf8proc - Small, clean library for processing UTF-8Unicode data.License
antirez/sds - Simple Dynamic Strings library for C.BSD 2-Clause
boyerjohn/rapidstring - Maybe the fastest string library ever.MIT
clibs/buffer - Tiny C string library.MIT
chrisjmccormick/word2vec_commented - Commented (but unaltered)version of original word2vec C implementation.Apache 2
fontforge/libuninameslist - A library with a large (sparse) arraymapping each unicode code point to the annotation data for it.BSD 3-Clause
jasonmaclafferty/String - Dynamic string data type implementation.MIT
josephg/librope - UTF-8 rope library for C.MIT
sheredom/utf8.h - Single header utf8 string functions for Cand C++.Unlicense
branchless-utf8 - Branchless UTF-8 decoder.Unlicense
g-berthiaume/strsepf - Single header string parsing function withmemory safety of strsep and the convenience of a sscanf-like interface.MIT
karlmcguire/sing - String ring buffer library.MIT

Testing

`^` Testing

yhfudev/cpp-ci-unit-test - A modern minimal hassle unit testframework.MIT
codeplea/minctest - Unit testing microlibrary.Zlib
evolutional/utest - Single-header unit testing library.Unlicense
Tuplanolla/cheat - Very simple unit testing framework.BSD 2-Clause
libcheck/check - Unit testing framework for C.LGPL 2.1
ThrowTheSwitch/CMock - Mock/stub generator for C.MIT
cmocka - Unit testing framework with support for mock objects.Apache 2
rafael-santiago/cutest - Library for unit testing with memory leakdetection (Linux, FreeBSD and Windows).GPL 2
nemequ/munit - Small but full-featured unit testing framework for Cwith no dependencies.MIT
zorgnax/libtap - Write tests in C.LGPL 3
Snaipe/Criterion - A cross-platform C and C++ unit testingframework for the 21th century.MIT
ThrowTheSwitch/Unity - Simple Unit Testing for C.MIT
bvdberg/ctest - Unit test framework for software written in C.Apache 2
clear-code/cutter - An easy to write and debug unit testingframework for C and C++.Licenses
compiler-dept/speck - A small unit testing framework for C.MIT
joewalnes/tinytest - A tiny unit-testing framework for C.No license
lpabon/cmockery2 - Reviving cmockery unit test framework fromGoogle.Apache 2
mcandre/qc - C port of the QuickCheck unit test framework.BSD 2-Clause
mchochlov/Gnucash - Data model unit testing - GSoC 2011.Licenses
mortie/snow - A testing library for C.MIT
orangeduck/ptest - DRY Microtesting Framework for C.BSD 3-Clause
silentbicycle/greatest - A C testing library in 1 file. Nodependencies, no dynamic allocation.ISC
silentbicycle/theft - property-based testing for C: generate inputto find obscure bugs, then reduce to minimal failing input.ISC
siu/minunit - Minimal unit testing framework for C.MIT
stephenmathieson/describe.h - Simple BDD describe test.MIT
vmg/clar - What tests are made of.ISC
CuTest - C Unit Testing Framework.Licenses
eerimoq/nala - Test framework for C projects. Based on narwhal andnarmock.MIT
vberlier/narwhal - Framework for writing readable and maintainabletests for C programs and libraries.MIT
vberlier/narmock - Finds the functions mocked in your tests andgenerates mocks.MIT
sheredom/utest.h - Single header unit testing framework. [Unlicense][80-61]
Koldar/crashc - Automatic C source code testing framework.MIT
christophercrouzet/rexo - Unit testing framework for C and C++.Unlicense

TUI

`^` TUI

Textual User Interface

sabotage-linux/netbsd-curses - Simplified and small version ofcurses, with the same interface.Licenses
ncurses - Coloured terminal UI library.Licenses
doches/progressbar - An easy-to-use C library for displaying textprogress bars.BSD 3-Clause
jwerle/progress.c - Progress display lib for c.MIT
nsf/termbox - Library for writing text-based user interfaces.MIT
alandekok/recli - A re-imagined CLI. Customizable syntax, help,permissions, data types.BSD 2-Clause
matthiasbock/ucurses - Very small and simple text-based userinterface (TUI) library for microcontrollers.GPL 3
serameo/TUI - Text User Interface using curses for UNIX.GPL 3
jakubfi/emui - Text user interface toolkit.License
nejohnson/stui - Simple Text User Interface.BSD 3-Clause
tboox/ltui - A cross-platform terminal ui library based on Lua.Apache 2
okbob/ncurses-st-menu - ncurses based library for CUA look menu.BSD 2-Clause
LionyxML/nocurses - A terminal screen manipulation library.GPL 2
seleznevae/libfort - Crossplatform library for formattedtext tables creation.MIT
LiquidityC/termesc - ANSI escape TUI library.No license
tryggth/newt - TUI library made by RedHat.License
serameo/TUI2 - TUI fox Unix.No license

Uncategorized

`^` Uncategorized

recp/tm - Timer and Timeline Utils for C.MIT
libgit2/libgit2 - Pure C implementation of Git.License
ThomasHabets/monotonic_clock - Portable C library for gettingmonotonic time.BSD 3-Clause
graphviz - Graph Visualization Tools.License
h2non/semver.c - semantic version parser and serializer written inANSI C.MIT
libical/libical - Libical is an Open Source implementation of theiCalendar protocols and protocol data units.Licenses
jonpe960/ufsm - UML Statechart library in C and XMI importer.BSD 3-Clause
locasto/libdisorder - A simple C library for entropy measurementof byte streams and other data.GPL 2
lucasb-eyer/heatmap - High performance C heatmap generationlibrary. Supposed to be wrapped by higher-level languages.MIT
tailhook/objpath - A library that allows to traverse datastructures by path.MIT
pornin/CTTK - Constant-Time Toolkit.MIT
juliettef/IconFontCppHeaders - C, C++ headers and C# classes foricon fonts: Font Awesome, Fork Awesome, Material Design, Material Designicons, Kenney game icons and Ionicons.Zlib
eam/libcrange - Range parsing library for managing sets ofostnames, ips, clusters, roles and other operational data.BSD 3-Clause

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Awesome C

Index

Meta

^ Standards

Tooling

^ Build Systems

^ Compilers

^ Debugging and Analysis

^ Documentation Generation

^ Editors

^ Microsoft Windows Environment

^ Profiling

^ Text Editor Extensions

^ Utilities

Reading Material

^ Books

Reference Books

Beginner Books

Intermediate Books

Advanced Books

Articles and Other Resources

^ Benchmarks

^ Beginner Level

^ Intermediate Level

^ Advanced Level

Code Examples

^ Operating Systems

^ Emulators, VMs

^ UI, Windowing, Graphics

^ Language Implementations

^ Challenges

^ Other Examples

^ AI

^ Algoritm Implementations

^ Argument Parsing

^ Calculations and Math

^ Compression

^ Concurrency and Parallelism

^ Cryptography

^ Databases

^ Data Structures and Types

^ Events

^ Foreign Function Interfaces

Filetype Targets

^ Binaries

^ CSV

^ HTML

^ JSON

^ INI

^ Markdown

^ XML

^ Other Filetypes

^ Flow Control and Language Extension

Game Development

^ Game Engines

^ Graphics Rendering

^ Gamedev Helping Libraries

^ Geography

^ GUI

^ Hardware Oriented

^ Hashing

^ Image Processing and Computer Vision

^ Integrated Debugging and Logging

^ I/O

^ Lexing and Parsing

^ Memory Management

^ Multimedia

^ Multiple Purpose Libraries