See also:

• Arts: Literature: Electronic Text Archives  (70)
• Arts: Music: Resources: Downloadable Music Sheets: Public Domain  (14)
• Arts: Online Writing: Non-Fiction  (117)
• Computers: Graphics: Clip Art: Public Domain  (7)
• Reference: Encyclopedias  (2,114)

Everything2 -  .

- An extensively hyperlinked collection of facts, ideas, notes and humor to which anyone can add.

Connected: An Internet Encyclopedia - - The engineering, theoretical concepts, and organizations of the Internet (freely distributable).

Cunnan - - An encyclopedia for reenactors of the Middle Ages and Renaissance period with a heavy slant towards members of the Society for Creative Anachronism.

dKosopedia - - A collaborative project of the DailyKos community to build a political encyclopedia featuring liberal points of view.

Linpedia - - A peer edited encyclopedia for Linux and Open source software. The project provides usable documentation that accommodates cross references and glossaries for all relevant terms in an article.

Memory Alpha - - A peer edited Star Trek encyclopedia.

Musipedia - - A collaborative music encyclopedia. Contains melodies and musical themes from classical, popular, and folk music. Can be searched based on the melody alone, either by playing it on a keyboard, whistling or singing, or by entering the melodic contour as Parsons Code.

Open Site - - A volunteer-run open content encyclopedia.

PlanetMath - - Collaborative, peer-reviewed mathematics encyclopedia with TeX input, inspired by MathWorld (GNU Free Documentation License).

Technomanifestos Network - - Collaborative resource on the history of computing and the Internet (GNU Free Documentation License), and the online companion to the book Technomanifestos.

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.