An encyclopedia or encyclopaedia, also (rarely) encyclopædia,Owing to differences in British and American English orthographic conventions, the spellings encyclopaedia and encyclopedia both see common use, in British-/Commonwealth- and American-influenced sources, respectively. The spelling encyclopædia – with the æ ligature – was frequently used in the 19th century and is increasingly rare, although it is retained in product titles such as Encyclopædia Britannica and others. The Oxford English Dictionary and Webster's Third New International Dictionary record both spellings: the former (1989) notes the æ would be obsolete except that it is preserved in works that have Latin titles, while the latter (1961-2002) notes that the digraph is rare in the U.S. Similarly, cyclopaedia and cyclopedia are rarely used truncations of the word originating in the early 17th century. is a comprehensive written compendium that contains information on all branches of knowledge or a particular branch of knowledge.
For a list of notable encyclopedias in history, see list of encyclopedias.
Electronic Text Archives :: Literature
Public Domain :: Downloadable Music Sheets
Non Fiction :: Online Writing
Public Domain :: Clip Art
Encyclopedias :: Reference

Everything2 - An extensively hyperlinked collection of facts, ideas, notes and humor to which anyone can add.
500
Connected: An Internet Encyclopedia - The engineering, theoretical concepts, and organizations of the Internet (freely distributable).
Cunnan - An encyclopedia for reenactors of the Middle Ages and Renaissance period with a heavy slant towards members of the Society for Creative Anachronism.
dKosopedia - A collaborative project of the DailyKos community to build a political encyclopedia featuring liberal points of view.
Linpedia - A peer edited encyclopedia for Linux and Open source software. The project provides usable documentation that accommodates cross references and glossaries for all relevant terms in an article.
Memory Alpha - A peer edited Star Trek encyclopedia.
Musipedia - A collaborative music encyclopedia. Contains melodies and musical themes from classical, popular, and folk music. Can be searched based on the melody alone, either by playing it on a keyboard, whistling or singing, or by entering the melodic contour as Parsons Code.
Meta Description: [ A search engine for tunes and musical themes and a collaborative music encyclopedia. Only the melody needs to be known to search Musipedia or the Web. The melody can be played on a keyboard or whistled or sung to the computer. The Musipedia collection is editable by anybody, just like Wikipedia. ]
Open Site - A volunteer-run open content encyclopedia.
Meta Description: [ Free, open content, community-built encyclopedia. ]
PlanetMath - Collaborative, peer-reviewed mathematics encyclopedia with TeX input, inspired by MathWorld (GNU Free Documentation License).
SourceWatch - A free encyclopedia of people, issues, and groups shaping the public agenda. It catalogs descriptions and details of PR firms, activist groups and government agencies as well as the criticisms that are made of these groups from different perspectives.
Technomanifestos Network - Collaborative resource on the history of computing and the Internet (GNU Free Documentation License), and the online companion to the book Technomanifestos.
Wikipedia Article - Nupedia - Nupedia was a public peer-reviewed general encyclopedia created by volunteer scholars, with resources for readers and contributors (GNU Free Documentation License). It can be considered to be Wikipedia's direct ancestor.
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