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Online version of the complete reference work along with dictionary, atlas, links, magazines, historical documents, audio, video, images, and 3D photographs. Requires free temporary registration with option to buy continued access for full articles.
http://www.worldbook.com/
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User edited encyclopedia based on Wiki software. Contains articles, information on editing, and a list of differences between this encyclopedia and Wikipedia.
http://www.wikinfo.org/
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User-contributed online encyclopedia intended for people whose first language is not English.
http://simple.wikipedia.org/
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Reference source with several hypertext linked entries covering a broad variety of subjects.
http://www.probert-encyclopaedia.co.uk/
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Online home of the Encarta encyclopedia, world atlas, dictionary, thesaurus, multimedia collection, and homework tools.
http://encarta.msn.com/
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Browsable. Based on the eleventh edition of the Encyclopedia Britannica, first published in 1911.
http://www.1911encyclopedia.org/
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"A subset of the content (concise set) is provided for free, the access to the rest of the Hutchinson Encyclopedia requires subscription."
http://encyclopedia.farlex.com/
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Articles explain how hundreds of things work, from elements of the human body to space-age technology.
http://www.howstuffworks.com/
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Offers the 11th Edition Encyclopedia Britannica which is now in the public domain. All articles are searchable and alphabetized.
http://encyclopedia.jrank.org/
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Provides complete text of Encyclopaedia Britannica with search capabilities, related links, and multimedia enhancements. Full text for subscribers only; free trial available.
http://www.britannica.com/
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Featuring 28,000 short articles.
http://concise.britannica.com/
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Includes the Columbia Encyclopedia, Sixth Edition, dictionaries, thesauri, and more.
http://www.bartleby.com/
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