Encarta Online Concise Encyclopaedia
Free, abridged version with over 16,000 reference articles covering topics such as technology, life science, history, social science, religion and philosophy, art and literature.

Encyberpedia
Electronic encyclopedia with original content as well as links to other references sites on the internet.

Encyclopedia Britannica
Complete Encyclopedia with articles from 70 top magazines, a guide to best websites and a lot more.

Encyclopedia of Fun Trivia
Thousands of categorised articles of trivia.

Encyclopedia of Symbols
World's largest on-line encyclopedia of graphic symbols from ideograms by Cro-Magnon man to hobo signs and subway graffiti. Included are articles on their histories, uses and meaning. Use the graphic index to search for the meaning of a sign or Word index for a corresponding image.

Encyclopedia Smithsonian.
Features resources from the Smithsonian Institution archives, ranging from anthropology, military history, mineral sciences, to transportation history and vertebrate zoology.

The Probert Encyclopedia
Serious reference source with thousands of entries in many categories.

TransHub: The Encyclopedia of Terminology
A site with links to all sorts of web dictionaries, translators and word-related web sites. Include science, law, business terminology, slang and other categories.

World Book Encyclopedia
In-depth information on many subjects, with sections for students, educational activities and features on current events.