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.
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.
Details on this open code encyclopedia project created by volunteer editors. Includes articles, information on submitting, and how to apply to be an editor.