Tag3D - http://www.croftsoft.com/portfolio/tag3d/ Interactive Virtual World system using Java3D and RMI. [Open Source]
Worlds.com - http://www.worlds.net/ Chat in a virtual reality 3D world.
The MUGU Project - http://mugu.sourceforge.net/ Massively-multiplayer roleplaying game system, emphasising graphics over text. [Open source, GPL]
Ad Infinitum - http://sourceforge.net/projects/adi/ Massively multiplayer game. [Open Source]
Fate - http://fate.sourceforge.net/ Massively multiplayer space trading and combat game. [Open Source]
The Millport project - http://millport.sourceforge.net/ Development site for a massive multiplayer game with a graphical interface, written in Java. [Open Source, GPL]
Oneiro - http://sourceforge.net/projects/oneiro/ A text-centric, adventure game engine written in Java. [Open Source, GPL]
Mars Simulation Project - http://mars-sim.sourceforge.net/ Open source Java project to create a simulation of future human settlement on the planet Mars. [Open Source, GPL]
Building Virtual Worlds To Teach Archaeology: - http://www.cs.ucf.edu/~moshell/CREAT/Caracol/TimeTravelRep.html Discusses the creation of a virtual world to teach archaeology and the life of the ancient Maya to a target audience of middle school students.
Virtual Universe - http://www.3dchat.org/ More than only a simple 3d-chat: here a complete virtual reality is simulated.
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