11. Also look at: RealXtend - http://www.realxtend.org/ - OpenSim/Second Life based project with extensions to the client
12. Open Croquet Image: http://en.wikipedia.org/wiki/Image:Croquet_Screenshot.jpeg
13.
14. Sun Wonderland / MPK20 https://lg3d-wonderland.dev.java.net/ Project Wonderland: Toolkit for Building 3D Virtual Worlds Experimental Technology sponsored by this community and Sun Microsystems Laboratories Project Wonderland is a toolkit for creating collaborative 3D virtual worlds. Within those worlds, users can communicate with high-fidelity, immersive audio, and can share live applications such as web browsers, OpenOffice documents, and games.