Fate - Massively multiplayer space trading and combat game. [Open Source] Mars Simulation Project - Open source Java project to create a simulation of future human settlement on the planet Mars. [Open Source, GPL] Worlds.com - Chat in a virtual reality 3D world. Ad Infinitum - Massively multiplayer game. [Open Source] The MUGU Project - Massively-multiplayer roleplaying game system, emphasising graphics over text. [Open source, GPL] Tag3D - Interactive Virtual World system using Java3D and RMI. [Open Source] Oneiro - A text-centric, adventure game engine written in Java. [Open Source, GPL]