Wikia is a community site that anyone can contribute to. Discover, share and add your knowledge!
wikiHow is a wiki based collaboration to build the world’s largest, highest quality how to manual. Our multilingual how to manual has free step-by-step instructions on how to do all types of things.
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Wikimedia is a global movement whose mission is to bring free educational content to the world.
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Wikibooks is a Wikimedia community for creating a free library of educational textbooks that anyone can edit.