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
Updated emulator of Forgotten Realms: Unlimited Adventures
Cross-platform dice roller for multiple RPG systems.
An unmodified version of the MMORPG Impressive Title by KovuLKD
BattleTech MUX Client
General Purpose Engine for Graphic Adventures.
ZxoR Mafia Bot is an IRC text based game based on the party game
Keybinds
Ur-Quan Masters High Definition
Quick way for a DM to generate content for a D&D game
Basic Character Creator for Warhammer Fantasy Role Play
The Clue! / Der Clou!