The FastLED library for colored LED animation on Arduino
A C++ library for AVR and NodeMCU
Cross-platform IDE for developing embedded solutions and desktops
MIDI for Arduino
Open-source RTOS and Embedded Systems Toolkit for C++ and C
EtherCard is an IPv4 driver for the ENC28J60 chip
Vanyamba Electronics library of C++ Classes for AVR.
Ecos for AVR32 targets
LED Color Control System for RaspberryPi and Dreambox
AVR ambilight project
Easy_AVR
VMLAB User Components for AVR peripherals and external components