Everything2 An extensively hyperlinked collection of facts, ideas, notes and humor to which anyone can add. http://www.everything2.com/

MusicBrainz Downloadable song metadata--artist/album/track information--for audio CD and MP3 music players (Open Content License). http://www.musicbrainz.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. http://www.technomanifestos.net

PlanetMath Collaborative, peer-reviewed mathematics encyclopedia with TeX input, inspired by MathWorld (GNU Free Documentation License). http://www.planetmath.org

Connected: An Internet Encyclopedia The engineering, theoretical concepts, and organizations of the Internet (freely distributable). http://www.freesoft.org/CIE/

Open Site A volunteer-run open content encyclopedia. http://open-site.org/

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. http://www.metaweb.com/

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. http://www.disinfopedia.org/

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. http://en.wikipedia.org/wiki/Nupedia

Creative Commons License Generator Service allowing quick and easy selection of one of a range of Open Content licenses to meet a content creators' requirements (concerning attribution, whether commercial use is allowed, and whether modification is allowed). http://creativecommons.org/license/