Note: None of these are completely done.

All of these are under the GPL 

Lightweight javascript 2d engine
LinkSprite Serial Camera Test
dsPIC VGA 3D Engine
Weather Globe
6502 Emulator
Robot Simulator
Fourier Audio
Kinematic Chain
Insanity Pong
Quadtree Terrain
Quadtree
Maze Solver
Spring Mass 3D
Spring Mass 2D
Spectrum Analyzer
Evolution Simulator
Win32 Webcam capture example
Borland libs 
Win32 3D engine
Win32 Raycaster
Small Instruction Set Emulator (code) 
Ant simulation 
Network Speed Tester (client/server) 
Mandelbrot Explorer
Expression Parser 
Binary Neural Network Simulator 
The game of set
VGA Graphics class