A lightweight, easy-to-use library of C code for AVR microcontrollers.
Koan Advanced Embedded Industrial Linux Operating System
KaeilOS is an embedded linux GNU/GPL distribution composed of a collection of the best publicly available Open Source packages. Version 4.00 available since January 2009 has joined OpenEmbedded project offering a wider selection of packages and recipes.
Rechannel is a language extension for SystemC.
SpinDrive is a Parallax Propeller Chip-based engine control system.
freecontroller provides free implementations of several control algorithms and numeric simulations of dynamic systems. at the moment the whole project is written in c.