Just pointing out that there is a new alternative (and hopefully will be better then) "Spore" in the works, but they need programmers. If your interested or know someone who might be interested feel free to visit their development forum: http://thrivegame.forum-free.ca/
Though a more detail description can be found here: http://www.moddb.com/games/thrive as well as a cell editor, and AI editor (both prototypes) in downloads.
It is open-source + non-profit.
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