GemRB is a portable open-source implementation of the Infinity Engine
Arianne is an engine to develop multiplayer online games like Stendhal
Cooperative multiplayer graphical RPG and adventure game
BattleTech MUX Client
General Purpose Engine for Graphic Adventures.
Defeat all the beasties to claim victory!
A roguelike, contains binaries and source packages for
Simple GUI to create a CYOA Build-logfile.
Cross platform 2D game creation framework with Python bindings