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• ATID Jewish Encyclopedia [ Kids-Teens-Mature Teens ] + The Jewish Encyclopedia For Kids is made as an online educational site for children who are interested in Jewish facts and history.
• Bartleby.com Reference [ Kids-Teens-Mature Teens ] + Reference site allows you to search over the Columbia Encyclopedia, the Encyclopedia of World History, fact books, thesauri, quotes, and more.
• Children's Encyclopedia of Women [ Kids ] + Collection of articles about famous women written by third and fourth grade students.
• Columbia Encyclopedia + 6th edition [ Teens-Mature Teens ] + Comprehensive online encyclopedia and database of over 51,000 entries.
• Encyclopaedia Britannica [ Teens-Mature Teens ] + Provides complete text of Encyclopaedia Britannica with search capabilities, related links, and multimedia enhancements. Free trial available.
• Encyclopedia Smithsonian [ Kids-Teens-Mature Teens ] + Links to online Smithsonian resources and answers to frequently asked questions from A to Z.
• Encyclopedia.com [ Kids-Teens-Mature Teens ] + Free resource offers more tens of thousands of articles from multiple sources.
• EncycloZine: Learning Fun! [ Kids-Teens-Mature Teens ] + EncycloZine is a concise illustrated encyclopedic portal covering a wide range of topics in the arts, humanities, sciences, and technology. It also features games, puzzles, quizzes, and a multimedia gallery.
• How Stuff Works [ Kids-Teens-Mature Teens ] + Articles explain how hundreds of things work, from elements of the human body to space+age technology.
• Instrument Encyclopedia [ Kids-Teens-Mature Teens ] + A guide to more than musical 140 instruments from all parts of the world. Includes photographs and descriptions.
• MSN Encarta Encyclopedia [ Kids-Teens-Mature Teens ] + Includes a world atlas, dictionary, thesaurus, multimedia collection, and homework tools.
• Open Site [ Teens-Mature Teens ] + A volunteer+run open content encyclopedia, inspired by the Open Directory Project.
• Spartacus Educational [ Kids-Teens-Mature Teens ] + British online encyclopedia focuses on historical topics. Articles are geared toward students.
• TechEncyclopedia [ Kids-Teens-Mature Teens ] + Contains descriptions and definitions of more than 14,000 computer terms and concepts.
• VetCentric Encyclopedia [ Mature Teens ] + Find articles on animal health care topics ranging from behavior and preventive care to common and not+so+common diseases.
• Wikipedia [ Kids-Teens-Mature Teens ] + Free volunteer+edited encyclopedia with over 2.1 million articles.
• 2007 Wikipedia Selection for schools [ Teens-Mature Teens ] + Selection of Wikipedia articles chosen and checked for accuracy.
• wordIQ.com [ Teens-Mature Teens ] + An online encyclopedia with more than 400,000 pages of content.
• World Book Encyclopedia [ Kids-Teens ] + Offers in+depth information on a variety of subjects and educational activities for children.