Graphical program to map keyboard and mouse controls to a gamepad
Real Time Strategy game engine supporting early Westwood classics
An award-winning drawing program for children of all ages
FlightGear Flight Simulator: free open-source multiplatform flight sim
A very efficient tutor.
Chess Database and PGN viewer
Colonize the New World.
For exploring cellular automata like Conway's Game of Life.
A modern, cross-platform Quake game engine based on FitzQuake.
C64/Amiga emulator with shader and runAhead
3D Engine c++
Good-looking and addictive OpenSource games
A cross-platform port of Hexen II game.
GemRB is a portable open-source implementation of the Infinity Engine