The FastLED library for colored LED animation on Arduino
Lightweight generic ring buffer manager library
Library designed for the Arduino Uno platform and AVRPascal editor
A GUI system for embedded systems.
MIDI for Arduino
A Java VM for ARDUINO and other micros using the leJOS runtime.
EtherCard is an IPv4 driver for the ENC28J60 chip
Electronic design and programming tools suite like Eagle, MpLab
A simulator for Atmel's 8/16-bit AVR microcontrollers