Alternative firmware for ESP8266 and ESP32 based devices with easy configuration using webUI, OTA updates, automation using timers or rules, expandability and entirely local control over MQTT, HTTP, Serial or KNX. Full documentation at

Flipper Zero Unleashed Firmware

Flipper Zero firmware source code

Lua based interactive firmware for ESP8266, ESP8285 and ESP32

Open Source Soldering Iron firmware

EDK II

A system daemon to allow session software to update firmware

Advanced firmware to add native Apple HomeKit and custom configurations, compatible with any SoC based on ESP32, ESP32-S, ESP32-C and ESP8266 series. (Shelly, Sonoff, Electrodragon, Tuya...)

Mongoose OS - an IoT Firmware Development Framework. Supported microcontrollers: ESP32, ESP8266, CC3220, CC3200, STM32F4, STM32L4, STM32F7. Amazon AWS IoT, Microsoft Azure, Google IoT Core integrated. Code in C or JavaScript.

The C-based Firmware Patching Framework for Broadcom/Cypress WiFi Chips that enables Monitor Mode, Frame Injection and much more

🐬 Feature-rich, stable and customizable Flipper firmware

Tools for handling firmwares of DJI products, with focus on quadcopters.

🔒 Trezor Firmware Monorepo

Restore/upgrade firmware of iOS devices

Alternative IP Camera firmware from an open community

Firmware for the Original Prusa MINI, Original Prusa MK4 and the Original Prusa XL 3D printers by Prusa Research.

Very Tiny Palmtop Vector Network Analyzer

Customizable Bootloader for STM32 microcontrollers. This example demonstrates how to perform in-application-programming of a firmware located on an external SD card with FAT32 file system.

Custom firmware for Yi 1080p camera based on MStar platform