Encyclopedias Websites

A volunteer-run open content encyclopedia.

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

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

The engineering, theoretical concepts, and organizations of the Internet (freely distributable).

An open wiki for statistical mechanics and thermodynamics.

Wiki encyclopedia project in which authors use their real, verified names and recognized subject experts can guide the development of citable articles.

Ekopedia is an encyclopedia about alternative life techniques with strong focus on ecological impact.