STM32 core support for Arduino
Open source framework simplifying the creation of C++ applications
WS2812 FX library for Arduino and ESP8266
RobBX - is a powerfull DIY Arduino constructor based from IQBX
Serial Bootloader for Microchip, Atmel, NXP, TI, 8051 microcontrolers
An Open Source POWERLINK Stack
open Transportation Control System
A realtime-schedule generator for educational purposes
5dpo Components for Lazarus
A Java VM for ARDUINO and other micros using the leJOS runtime.
An Open Source POWERLINK network configuration toolkit
Provides eclipse plugins for XDD edit, validation and OD generation.
A framework for implementing real-time control systems
Open source observatory control software
Summary
Random any number you want as many as you want
A C++ framework that uses inhibition trees for behaviour control.
A C++ implementation of a nonlinear 3D IMU fusion algorithm.