Articles and illustrations from the Encyclopaedia Britannica, 9th Edition (1875) and 10th Edition (1902). Searchable by keyword and browsable by subject index.

Free online encyclopedia for all ages. Explore a vast library of multimedia articles and information on a wide range of topics. Learn interactively with online videos, pictures, and more.

Searchable by keyword or browsable by subject index. Includes feature articles and interactive maps. Available in French and English.

An online encyclopedia that displays results from multiple encyclopedias.

Web based encyclopedia that allows users to edit and add articles. Includes instructions on how to contribute, current known bug reports, and recent changes.

Information on this open source volunteer created encyclopedia. Provides details on how to register and edit as well as project history and featured articles.

Provides articles, weekly trivia quiz, and links to popular searches. Also includes information on advertising, downloadable e-books, and a FAQ page.

Offers online access to the World Book Encyclopedia by subscription. Includes information on trial subscriptions, policies, and online store.

A concise illustrated encyclopedia including optical illusions, an Internet art gallery, and a Web design reference section.

Searchable encyclopedia. Also includes news, teacher resources, and homework help.

Browse through alphabetical lists or search by keyword.