Real Time Strategy game engine supporting early Westwood classics
Open source simulation game based on Transport Tycoon Deluxe
A free transportation simulator game
A very efficient tutor.
Chess Database and Toolkit program
A modern, cross-platform Quake game engine based on FitzQuake.
Colonize the New World.
Open and edit the archive files used in over 4200 games.
Realism Invictus mod for Civilization IV
XMLTV obtains and processes TV listings data
A 2D Real Time Strategy space combat game.
The ultimate cataloguer
A 2D scrolling platform shooter, inspired by Duke Nukem 1
Action RPG that's easy to mod
Cross-platform real-time strategy game (3D)
A free and open source sudoku game for addicts to newbies
General Purpose Engine for Graphic Adventures.
A 16 bit style game on the 16-bit IBM XT.
open-source implementation of the "kropki" (aka "tochki") game