Arduino libraries and code
Arduino FOC for BLDC and Stepper motors
ESP8266 core for Arduino
Infrared remote library for Arduino, send and receive infrared signals
freeRTOS for Arduino Uno, Goldilocks 1284p & Mega 2560
Optimized firmware for RepRap 3D printers based on Arduino platform
The FastLED library for colored LED animation on Arduino
Powerful and easy-to-use embedded GUI library with many widgets
7 seg universal Arduino Ardui89 AVR 8051 Device Driver 89C51 89C52...
A small Arduino library for GSM modules, that just works
JSON library for Arduino and embedded C++. Simple and efficient
Cooperative multitasking for Arduino, ESPx, STM32, nRF and more
arduinoWebSockets
An open source E-ink smartwatch
Arduino and PlatformIO IDE compatible TFT library
An Arduino NeoPixel support library
OSI Layer 2 driver for nRF24L01 on Arduino & Raspberry Pi/Linux
Blynk library for embedded hardware
Arduino library to play MOD, WAV, FLAC, MIDI, RTTTL, MP3
Go compiler for small place
Open source framework simplifying the creation of C++ applications
WS2812 FX library for Arduino and ESP8266
Lightweight generic ring buffer manager library
Open-source electronics platform
Infrared remote library for ESP8266/ESP32