GemRB is a portable open-source implementation of the Infinity Engine
Arianne is an engine to develop multiplayer online games like Stendhal
GM tool for the RPG game "Legend of the Five Rings" 4th edition
Defeat all the beasties to claim victory!
Provides a full suite of clients and servers for virtual worlds.
Experiments in turn based strategy gaming.
A Dungeons & Dragons Miniature Game.