A volunteer-run open content encyclopedia, inspired by the Open Directory Project.
Collection of articles about famous women written by third and fourth grade students.
Free resource offers more tens of thousands of articles from multiple sources.
Provides complete text of Encyclopaedia Britannica with search capabilities, related links, and mul...
Offers in-depth information on a variety of subjects and educational activities for children.
Articles explain how hundreds of things work, from elements of the human body to space-age technolo...
Reference site allows you to search over the Columbia Encyclopedia, the Encyclopedia of World Histo...
A free, hand-checked, non-commercial selection from Wikipedia, targeted around the UK National Curr...
Links to online Smithsonian resources and answers to frequently asked questions from A to Z.
British online encyclopedia focuses on historical topics. Articles are geared toward students.