Alternatives

Metaplace

Embeddable in a site:

http://www.raphkoster.com/2009/06/30/embed-virtual-worlds-anywhere/

Other virtual worlds:

None of the sites below have been evaluated yet.

Active Worlds: http://www.activeworlds.com/
Kaneva: http://www.kaneva.com/
HiPiHi: http://www.hipihi.com/ (Chinese)
There: http://www.there.com/
Moove Online: http://www.moove.com/

Open Source Platforms:

Multiverse: http://www.multiverse.net/
The Metaverse Project: http://metaverse.sourceforge.net/
Qwaq Forums: http://www.qwaq.com/
Ogoglio: http://ogoglio.com/

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