Virtual Worlds
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Commercial, closed source
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Open source, raw, with minimal features.
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Can be accessed with SecondLife client with some extra command line params.
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Open source, no download package, but can get at source directly and presumably build it yourself.
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Screen shots show things as fairly flat looking, and not as 3D as SecondLife or OpenSim.
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Screenshots look pretty flat and cartoony.
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Commercial, very good rendering judging from the screen shots.
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Looks like there's the option to create your own worlds.
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There is an SDK that speaks the protocol so one can make software agents external to the worlds rather than a floating wood block shooting fireworks in LSL.
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Open Source, 2D and still at the very early stages of development
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Commercial, but the tools are free.
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Browser and can serve your own worlds.
