Britannica.com Searchable encyclopedia. Also includes news, teacher resources, and homework help.
1902 Encyclopedia Articles and illustrations from the Encyclopaedia Britannica, 9th Edition (1875) and 10th Edition (1902). Searchable by keyword and browsable by subject index.
Canadian Encyclopedia, The Searchable by keyword or browsable by subject index. Includes feature articles and interactive maps. Available in French and English.
EncycloMedia 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.
Encyclopedia.com Browse through alphabetical lists or search by keyword.
EncycloZine A concise illustrated encyclopedia including optical illusions, an Internet art gallery, and a Web design reference section.
Factopia.com An online encyclopedia that displays results from multiple encyclopedias.
Probert Encyclopedia Provides articles, weekly trivia quiz, and links to popular searches. Also includes information on advertising, downloadable e-books, and a FAQ page.
Wikinfo Web based encyclopedia that allows users to edit and add articles. Includes instructions on how to contribute, current known bug reports, and recent changes.
Wikipedia Information on this open source volunteer created encyclopedia. Provides details on how to register and edit as well as project history and featured articles.
World Book Offers online access to the World Book Encyclopedia by subscription. Includes information on trial subscriptions, policies, and online store.