A game engine powered by python and panda3d
3D game engine/framework in C, with Luajit and Python bindings now
3D space trading and combat game
Zig game engine & graphics toolkit
Various things for PSX (PlayStation 1, PSone)
Gideros Release version
Game engine supporting many 3D/2D formats and graphic effects
Open and edit the archive files used in over 5700 games.
GemRB is a portable open-source implementation of the Infinity Engine
IsoCity: City building simulation game
An updated version of the classic "Basic Computer Games" book
Cooperative multiplayer graphical RPG and adventure game
A modern, cross-platform Quake game engine based on FitzQuake.
first person shooter, space invader
Odamex is a free, cross-platform, modern client-server Doom engine
4X Space Strategy Game
0 A.D. is a free, open-source, cross-platform real-time strategy game.
For exploring cellular automata like Conway's Game of Life.
Air traffic control tower and radar simulator (solo + multi-player)
Arianne is an engine to develop multiplayer online games like Stendhal
A cross-platform port of Hexen II game.