A strategy game with a high fantasy theme
A modern, cross-platform Quake game engine based on FitzQuake.
Seven Kingdoms: Ancient Adversaries
RTS game with the theme of Strategy by Design
A free transportation simulator game
a (simple) Sokoban game
Old style soccer game with many exciting features
Odamex is a free, cross-platform, modern client-server Doom engine
3D driving simulation based on Open Dynamics Engine
simple chess game written in C
GemRB is a portable open-source implementation of the Infinity Engine
Hardcore 3D space shooter with spaceship upgrade possibilities.
SDL based generic 2D game engine
0 A.D. is a free, open-source, cross-platform real-time strategy game.
A cross-platform port of Hexen II game.
WW2 U-boat simulation