uVGA is a 100% hardware VGA driver for teensy 3.6, 3.2 (& probably 3.5)

Free USB Stack for PIC 16F, 18F, 24F, and 32MX Microcontrollers

RepRapPro's version of Prusa Mendel

An out-of-tree implementation of contiki that adds new platforms and projects.

For tracking Pot Holes on the streets

CircuitPython - a Python implementation for teaching coding with microcontrollers

A robotic arm developed with Arduino

A relatively simple but effective soft core processor