HiPiHi http://www.altoxeno.com/hipihi

Tribal Net http://www.tribalnet.se/

Twinity http://www.twinity.com/en

———-

http://vside.com

http://www.activeworlds.com

http://www.there.com

—- OpenSource —-

http://metaverse.sourceforge.net

OpenMetaverse

(OpenSim, OpenSL, libsecondlife, Open Grid Services)

http://openmetaverse.org