mkbootimg + unpackbootimg, forked and updated

Ports of Tock for STM32 chips and discovery boards

A secure embedded operating system for microcontrollers

RIOT - The friendly OS for IoT

GNUradio OOT module for Outernet

Free Software Outernet receiver

The open source (GPL v2) turn-by-turn navigation software for many OS

Connect Raspberry-Pi to CC1101 RF module and play with AX.25/KISS to transmit TCP/IP over the air

Arduino client for esp-link's REST, MQTT, and command interface

esp8266 wifi-serial bridge, outbound TCP, and arduino/AVR/LPC/NXP programmer

Linux kernel module driver for the ESP8089 WiFi chip

MQTT client library for ESP8266

antares uC buildsystem

Examples of code for the ESP8266

IDAPython plugin for Tensilica Xtensa (as seen in ESP8266)

Git Mirror of Yann Morin's kconfig-frontends project

Alternative firmware for ESP8266 modules

crosstool-NG with support for Xtensa

The libhal part of the SDK

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

Espressif SoC serial bootloader utility