General Purpose Engine for Graphic Adventures.
GemRB is a portable open-source implementation of the Infinity Engine
Cooperative multiplayer graphical RPG and adventure game
Arianne is an engine to develop multiplayer online games like Stendhal
Cross-breeding a 3D FPS with a fantasy RPG in the world of Hexen
Ze Text Adventure game Builder : Create as you play !
KildClient is a powerful MUD client with a built-in Perl interpreter
InterBBS medieval door game
NetHack made ready for internationalization
Helpful tools to extend the NWN Toolset
Opengate is a Jumpgate remake
Cross-platform dice roller for multiple RPG systems.