GemRB is a portable open-source implementation of the Infinity Engine
General Purpose Engine for Graphic Adventures.
Ze Text Adventure game Builder : Create as you play !
RPG character generator for RPG d20 systems.
PvP, MUD RPG.
KCG is the (N)PC generation tool for the Kontinuum RPG system.
Calculate various aspects of the Kontinuum RPG system.
Old School gaming tool for GMs of AD&D/OSRIC.
A videogame about the wonders of operating system concepts.
An Open Source RPG - a tabletop game