WS2812 FX library for Arduino and ESP8266
The Open On-Chip Debugger
USB Bridge for SMBus/I2C, GPIO, & Clock
Haptic input knob with software-defined endstops and virtual detents
C for programmable guitar amp
EventMachine, fast, simple event-processing library for Ruby programs
A system for programming LPC, STM32 and possible others devices.
The serial LCD module using ATmega8 along with easy arduino library.