The free and Open Source hockey simulator
Library for creating turn-based games with simultaneous moves.
Modular Gaming Open Source Persistent Browser Based Game Framework
TurboSphere is an easy to learn and powerful JS based game engine.
TR Game Engine allows you to develop your game quickly and easily.
Take the chess graphism, and use it with a chess engine.
Classic backgammon in fantasy setting with a lot of missions.
Pygrid is an open-source and cross-platform pygame/python 2D engine.
Cross platform administration tool for Source Engine dedicated servers
A multiplatform game engine for interactive fiction experiences
A world editor for HGE game engine written in python and uses OpenGL.
A 3D, fully concurrent game engine
A free engine for C&C Tiberian Dawn
TSE is a scripting language and engine for game programming.