- Wikipedia. The world's largest web-based and fastest growing free encyclopedia built collaboratively.
- Encyclopedia. Online Encyclopedia with more than 50,000 articles.
- Answers.com Free "one-stop shop" with instant information on over 4 million topics.
- Refdesk. A free, user-friendly site that indexes and reviews quality, credible, and current web-based resources.
- World Almanac. An American-published reference work and the bestselling almanac.
Encyclopedias of Special Subjects
- Medical encyclopedia. Including over 4,000 articles about diseases, tests, symptoms, injuries, and surgeries.
- Web Concordancer. You can search an online corpus for a word and display all the sentences in which the word occurs.
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