- Connected: An Internet Encyclopedia - The engineering, theoretical concepts, and organizations of the Internet (freely distributable).
www.freesoft.org/CIE
- MusicBrainz - Downloadable song metadata--artist/album/track information--for audio CD and MP3 music players (Open Content License).
www.musicbrainz.org
- Nupedia - Public peer-reviewed general encyclopedia created by volunteer scholars, with resources for readers and contributors (GNU Free Documentation License).
www.nupedia.com
- PlanetMath - Collaborative, peer-reviewed mathematics encyclopedia with TeX input, inspired by MathWorld (GNU Free Documentation License).
www.planetmath.org
- Technomanifestos Network - Collaborative resource on the history of computing and the Internet (GNU Free Documentation License), and the online companion to the book Technomanifestos.
www.technomanifestos.net
- The Fact Factory - Incomplete, Wikipedia-derived, with many advertising links.
the-fact-factory.com
- Wikipedia - A free encyclopedia built collaboratively using Wiki software; over 40,000 articles and growing (GNU Free Documentation License).
www.wikipedia.org
- Everything2 - An extensively hyperlinked collection of facts, ideas, notes and humor to which anyone can add.
www.everything2.com
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