STM32 core support for Arduino
Open source framework simplifying the creation of C++ applications
OpenBot leverages smartphones as brains for low-cost robots
Native Apple HomeKit accessory implementation for the ESP8266 Arduino
ESP8266 framework for Homie, a lightweight MQTT convention
MIDI for Arduino
Autonomous aviation intelligence software for drones and VTOL
A Java VM for ARDUINO and other micros using the leJOS runtime.
An Open Source POWERLINK network configuration toolkit
An eclipse plugin for the openCONFIGURATOR configuration tool
A framework for implementing real-time control systems
Open source observatory control software
Solution for changing your device into full-feature CNC controller
Summary
ROS-Enhanced Scalable Haptic Library - discontinued
LensOSX: the light, efficient network simulator
Quadcopter Remote Control by RaspberryPi
openPOWERLINK with Analog Devices ADSP-CM408F Mixed Signal Controller
VEX Robotics Competition Simulator
How to build ROS (Robot Operating System) for the iOS platform.
Complete ROV Control Suite
Tool for programming AVR chips