- Citizendium
- Collegial encyclopedia project set up to enhance accountability in the free encyclopedia field.
- Cunnan
- Encyclopedic compilation of information for re-enactors of the Middle Ages and Renaissance.
- dKosopedia
- Political encyclopedia written from a leftist, progressive, liberal, and Democratic point of view.
- Everything2.com
- Online collection of information, ideas, notes and humor that also accommodates user inputs or submissions.
- Memory Alpha
- Peer-edited encyclopedia dedicated to Star Trek topics and interests.
- Musipedia
- Searchable collection of tunes and musical themes that can be openly edited.
- Open-Site
- Volunteer-run and open content encyclopedia for free access.
- PlanetMath
- Online encyclopedia and community of mathematical knowledge. Provides collaboratively-created content.
- SourceWatch
- Purposely created to document the public relation and propaganda activities of public relations firms and public relations professionals.
- SourceWatch
- Center for Media and Democracy project aimed at creating a reference of the people, organizations, and issues that shape the public agenda.
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