Open source simulation game based on Transport Tycoon Deluxe
An award-winning drawing program for children of all ages
FlightGear Flight Simulator: free open-source multiplatform flight sim
RTS game with the theme of Strategy by Design
A strategy game with a high fantasy theme
Chess Database and Toolkit program
A modern, cross-platform Quake game engine based on FitzQuake.
Colonize the New World.
A standalone UQM mod made to enhance gameplay and visuals
Chess Database and PGN viewer
Open and edit the archive files used in over 4200 games.
Good-looking and addictive OpenSource games
For exploring cellular automata like Conway's Game of Life.
A cross-platform port of Hexen II game.
Odamex is a free, cross-platform, modern client-server Doom engine
Seven Kingdoms: Ancient Adversaries