C++ framework with an ide.
Programming language with expressive power and a simple implementation
A small C compiler
a Productive Parallel Programming Language
Electronic design and programming tools suite like Eagle, MpLab
A readable lisp in less than 1k lines of C
An HDL alternative to PCB graphical schematic capture tools.
Rewrite of the CoffeeScript compiler with proper compiler design
WIttgen is a two-instruction programming language modeled on the mind.