Technomanifestos Network Technomanifestos Network: Collaborative resource on the history of computing and the Internet (GNU Free Documentation License), and the online companion to the book Technomanifestos. (Encyclopedias) http://www.technomanifestos.net
Connected: An Internet Encyclopedia Connected: An Internet Encyclopedia: The engineering, theoretical concepts, and organizations of the Internet (freely distributable). (Encyclopedias) http://www.freesoft.org/CIE/
PlanetMath PlanetMath: Collaborative, peer-reviewed mathematics encyclopedia with TeX input, inspired by MathWorld (GNU Free Documentation License). (Encyclopedias) http://www.planetmath.org
Open Site Open Site: A volunteer-run open content encyclopedia. (Encyclopedias) http://open-site.org/
Everything2 Everything2: An extensively hyperlinked collection of facts, ideas, notes and humor to which anyone can add. (Encyclopedias) http://www.everything2.com/
Disinfopedia Disinfopedia: 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. (Encyclopedias) http://www.disinfopedia.org/
Wikipedia Article - Nupedia 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. (Encyclopedias) http://en.wikipedia.org/wiki/Nupedia
Metaweb Metaweb: A project initiated by author Neal Stephenson as a resource first to annotate his novel Quicksilver, but based on the broader concept of a "metaweb" devised by Danny Hillis. (Encyclopedias) http://www.metaweb.com/
MusicBrainz MusicBrainz: Downloadable song metadata--artist/album/track information--for audio CD and MP3 music players (Open Content License). (Encyclopedias) http://www.musicbrainz.org
Additional
Information: Online encyclopedias which are released under open-content licenses or are freely distributable.
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