Free and open (as much as possible) integrated SDK for ESP8266/ESP8285 chips

• UpdatedJan 12, 2022
• Makefile

All CPU and MCU documentation in one place

• UpdatedFeb 8, 2026
• HTML

The OpenSource Disassembler

• UpdatedOct 27, 2024
• C++

ESP32 software USB host through general IO pins. We can connect up to 4 USB-LS HID (keyboard mouse joystick) devices simultaneously.

• UpdatedFeb 23, 2025
• C

A compiler for ARM, X86, MSP430, xtensa and more implemented in pure Python

• UpdatedOct 3, 2025
• Python

Linux port for xtensa architecture. None of these branches are stable.

• UpdatedFeb 19, 2026
• C

Peripheral Access Crates for Espressif SoCs and modules

• UpdatedFeb 13, 2026
• Rust

A kernel written in Rust

• UpdatedDec 9, 2024
• Rust

Implementation of target-xtensa for QEMU.

• UpdatedJun 5, 2025
• C

FreeRTOS for Cadence Tensilica HIFI 4 DSP on R329, D1-H, T113 With GCC Compiler

• UpdatedMay 4, 2024
• C

Forth for ESP-8266

• UpdatedMay 2, 2016
• C

• UpdatedFeb 18, 2021
• TeX

Interpreter experiment. Testing dispatch methods: Switching, Direct/Indirect Threaded Code, Tail-Calls and Inlining

• UpdatedSep 29, 2020
• C

Run Linux on esp8266.

• UpdatedApr 17, 2024
• C

Generating the call graph from elf binary file

• UpdatedMay 3, 2023
• Assembly

ESP32 Firmware Patching Framework with Streamlined Binary/Runtime Patching Methods. Used in conjunction with Platformio and Ghidra.

• UpdatedFeb 4, 2022
• Python

IDAPython plugin for Tensilica Xtensa (as seen in ESP8266), version 2

• UpdatedFeb 24, 2017
• Python

ESPxRGB is an Arduino/ESP-IDF library of RGB, RGBW, HSV conversion functions and Gamma Correction written in Xtensa assembler for ESP SoCs with Xtensa cores (ESP32).

• UpdatedSep 19, 2021
• Assembly

take off every zig (forked)

• UpdatedFeb 14, 2026
• C

Bare-metal programming on ESP32-S3 dual-core Xtensa LX7 without using Espressif's ESP-IDF

• UpdatedMay 11, 2025
• C