wikipedia Similar projects
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Everything2, Everything "noded". Entries are owned (rather than collaboratively edited) but can have multiple entries. As you contribute, you can gain privileges such as voting on posts. Not as formal as Wikipedia and the repository of a variety of entries including reviews, fiction, as well as a large amount of non-fiction.
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Quora, a question and answer site on multiple topics
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Fanlore, is a wiki created to preserve the history and activities of fandoms
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Infogalactic, a Wikipedia-like project
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Eris Solver (http://www.erissolver.com), a complex problem solver
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wikilivres:, which supports Wikisource and Wikimedia Commons
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Stockepedia: The Encyclopedia of Stocks – information on listed companies (stocks) around the world specifically from an investor's viewpoint. See Stockepedia.
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SourceWatch – a collaborative project to produce a directory of public relations firms, think tanks, industry-funded organizations and industry-friendly experts that work to influence public opinion and public policy on behalf of corporations, governments and special interests. Sponsored by the Center for Media and Democracy
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GamePedia – a collaborative project to produce an encyclopedia about games and games related products, projects and systems.
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Memory Alpha – an encyclopedia on the fictional world of Star Trek.
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Homestar Runner Wiki – Dedicated to the world of Homestar Runner.
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Infobitt – a project initiated by wikipedia co-founder Larry Sanger.