Online encyclopedias which are released under open-content licenses or are freely distributable.
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- Open Site A volunteer-run open content encyclopedia.
- Everything2 An extensively hyperlinked collection of facts, ideas, notes and humor to which anyone can add.
- PlanetMath Collaborative, peer-reviewed mathematics encyclopedia with TeX input, inspired by MathWorld (GNU Free Documentation License).
- Connected: An Internet Encyclopedia The engineering, theoretical concepts, and organizations of the Internet (freely distributable).
- 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.
- SklogWiki An open wiki for statistical mechanics and thermodynamics.
- Citizendium Wiki encyclopedia project in which authors use their real, verified names and recognized subject experts can guide the development of citable articles.
- Ekopedia Ekopedia is an encyclopedia about alternative life techniques with strong focus on ecological impact.