| ATID Jewish Encyclopedia | | 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 | | Reference site allows you to search over the Columbia Encyclopedia, the Encyclopedia of World History, fact books, thesauri, quotes, and more. |
| Encyclopaedia Britannica | | Provides complete text of Encyclopaedia Britannica with search capabilities, related links, and multimedia enhancements. Free trial available. |
| EncycloZine: Learning Fun! | | 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 | | Articles explain how hundreds of things work, from elements of the human body to space-age technology. |
| Instrument Encyclopedia | | A guide to more than musical 140 instruments from all parts of the world. Includes photographs and descriptions. |
| MSN Encarta Encyclopedia | | Online home of the Encarta encyclopedia, world atlas, dictionary, thesaurus, multimedia collection, and homework tools. |
| Open Site | | A volunteer-run open content encyclopedia, inspired by the Open Directory Project. |
| Spartacus Educational | | British online encyclopedia focuses on historical topics. Articles are geared toward students. |
| TechEncyclopedia | | Contains descriptions and definitions of more than 14,000 computer terms and concepts. |
| VetCentric Encyclopedia | | Find articles on animal health care topics ranging from behavior and preventive care to common and not-so-common diseases. |
| Wikipedia | | Free volunteer-edited encyclopedia with over 200,000 articles. |
| wordIQ.com | | An online encyclopedia with more than 400,000 pages of content. |
| World Book Encyclopedia | | Offers in-depth information on a variety of subjects and educational activities for children. |
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