0 A.D. is a free, open-source, cross-platform real-time strategy game.
The classical MasterMind game revisited
A planetarium software that shows a 3D simulation of the night sky
VenenuX GNU/Linux
multiplayer stockmarket game for OpenVMS
A program to pick dominoes
Enter a two dimensional maze and exit automatically.
3D vehicle simulator based on Lagrangian dynamics to simulate dynamics
realistic truck simulator with 3D graphics done from zero
realistic truck & car simulator, with OpenGL graphics
An IRC bot which deals the game 21 aka Blackjack.
Arduino open source PID motor control