risc-v

Unlike most other ISA designs, the RISC-V ISA is provided under open source licenses that do not require fees to use. A number of companies are offering or have announced RISC-V hardware, open source operating systems with RISC-V support are available and the instruction set is supported in several popular software toolchains.

Notable features of the RISC-V ISA include a load–store architecture, bit patterns to simplify the multiplexers in a CPU, IEEE 754 floating-point, a design that is architecturally neutral, and placing most-significant bits at a fixed location to speed sign extension. The instruction set is designed for a wide range of uses. The base instruction set has a fixed length of 32-bit naturally aligned instructions, and the ISA supports variable length extensions where each instruction could be an any number of 16-bit parcels in length. Subsets support small embedded systems, personal computers, supercomputers with vector processors, and warehouse-scale 19 inch rack-mounted parallel computers.

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simdjson /simdjson

Star23.3k

Parsing gigabytes of JSON per second : used by Facebook/Meta Velox, the Node.js runtime, ClickHouse, WatermelonDB, Apache Doris, Milvus, StarRocks

c-plus-plus json neon x64 clang cpp11 simd json-parser avx2 json-pointer arm64 aarch64 avx512 gcc-compiler sse42 risc-v vs2019 clang-cl loongarch64 loongarch

UpdatedFeb 20, 2026
C++

mytechnotalent /Reverse-Engineering

Star13.3k

A FREE comprehensive reverse engineering tutorial covering x86, x64, 32-bit/64-bit ARM, 8-bit AVR and 32-bit RISC-V architectures.

c go rust golang c-plus-plus avr arm assembly x64 reverse-engineering malware hacking riscv cybersecurity assembly-language x86 assembly-language-programming cyber-security risc-v reverse-engineering-tutorial

UpdatedFeb 20, 2026
Assembly

RT-Thread /rt-thread

Star11.8k

RT-Thread is an open source IoT Real-Time Operating System (RTOS).https://rt-thread.github.io/rt-thread/

iot arm real-time microcontroller kernel cortex-m mips embedded-systems microkernel rtos risc-v cortex-a aiot

UpdatedFeb 13, 2026
C

k2-fsa /sherpa-onnx

Star10.4k

Speech-to-text, text-to-speech, speaker diarization, speech enhancement, source separation, and VAD using next-gen Kaldi with onnxruntime without Internet connection. Support embedded systems, Android, iOS, HarmonyOS, Raspberry Pi, RISC-V, RK NPU, Axera NPU, Ascend NPU, x86_64 servers, websocket server/client, support 12 programming languages

android windows macos linux lazarus raspberry-pi ios text-to-speech csharp cpp dotnet speech-to-text aarch64 mfc risc-v object-pascal asr arm32 onnx vits

UpdatedFeb 20, 2026
C++

platformio /platformio-core

Star8.9k

Your Gateway to Embedded Software Development Excellence 👽

debugging iot arduino esp8266 avr package-manager unit-testing arm microcontroller embedded libraries firmware esp32 ide platformio build-system cmsis rtos risc-v zephyr-rtos

UpdatedFeb 4, 2026
Python

OpenXiangShan /XiangShan

Star6.9k

Open-source high-performance RISC-V processor

chisel risc-v microarchitecture

UpdatedFeb 20, 2026
Scala

tock /tock

Sponsor

Star6.2k

A secure embedded operating system for microcontrollers

rust iot arm microcontroller embedded kernel cortex-m operating-system mcu tock risc-v secure-operating-system

UpdatedFeb 20, 2026
Rust

MichaIng /DietPi

Star5.9k

Lightweight justice for your single-board computer!

shell bash lightweight debian optimization raspberrypi odroid pine64 orangepi sbc risc-v dietpi nanopi radxa

UpdatedFeb 20, 2026
Shell

alibaba /AliOS-Things

Star4.6k

面向IoT领域的、高可伸缩的物联网操作系统，可去官网了解更多信息https://www.aliyun.com/product/aliosthings

iot microcontroller embedded os haas rtos risc-v haas-python

UpdatedJul 4, 2023
C

chyyuu /os_kernel_lab

Star4k

OS kernel labs based on Rust/C Lang & RISC-V 64/X86-32

rust kernel os lab risc-v

UpdatedJan 27, 2023
Rust

misprit7 /computerraria

Star3.8k

A fully compliant RISC-V computer made inside the game Terraria

riscv terraria logic-gates risc-v terraria-mod

UpdatedMar 24, 2025
Rust

mortbopet /Ripes

Star3.2k

A graphical processor simulator and assembly editor for the RISC-V ISA

education processor-architecture qt simulator computer-architecture risc risc-v cpu-emulator

UpdatedFeb 18, 2026
C++

limine-bootloader /limine

Star2.8k

Modern, advanced, portable, multiprotocol bootloader and boot manager. (Official mirror ofhttps://codeberg.org/Limine/Limine)

arm x64 x86-64 riscv x86 uefi bootloader arm64 mbr gpt aarch64 boot-loader efi bios risc-v boot-manager loongson riscv64 loongarch64 loongarch

UpdatedFeb 20, 2026
C

SI-RISCV /e200_opensource

Star2.8k

Deprecated, please go to next generation Ultra-Low Power RISC-V Corehttps://github.com/riscv-mcu/e203_hbirdv2

cpu core verilog china nuclei risc-v ultra-low-power

UpdatedMar 24, 2021
Verilog

openhwgroup /cva6

Star2.8k

The CORE-V CVA6 is a highly configurable, 6-stage RISC-V core for both application and embedded applications. Application class configurations are capable of booting Linux.

asic cpu fpga risc-v systemverilog-hdl rv64gc ariane