The FastLED library for colored LED animation on Arduino
Optimized firmware for RepRap 3D printers based on Arduino platform
Cross-platform IDE for developing embedded solutions and desktops
Real Time Electronic Circuit Simulator.
A C++ library for AVR and NodeMCU
MIDI for Arduino
Open-source RTOS and Embedded Systems Toolkit for C++ and C
EtherCard is an IPv4 driver for the ENC28J60 chip
AVR-related utility code
Electronic design and programming tools suite like Eagle, MpLab
rp6simul is a simulator for the RP6 robot (AREXX Engineering)
VMLAB User Components for AVR peripherals and external components