GemRB is a portable open-source implementation of the Infinity Engine
Final Fantasy VIII field archive editor
General Purpose Engine for Graphic Adventures.
Ur-Quan Masters High Definition
The Clue! / Der Clou!
Free MMORPG
Creates D&D monsters for use with Pathfinder ruleset
Provides a full suite of clients and servers for virtual worlds.
Nethack 1.3d revived for other platforms
3D urban environment renderer : browser-app ; as well as a GTA clone
Open-source 3D RTS game inspired by the Dungeon Keeper series