Dictionaries & Thesauri:

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• yourDictionary.com - The world's first linguistics company and the premiere web portal specializing in language. Provides a long list to dictionaries in almost every language imaginable as well as Thesauri and Other Vocabulary Aids, Language Identifiers and Guessers, an Index of Dictionary Indices, a Web of On-line Grammars and a Web of Linguistic Fun.
• Thesaurus.com - Fully searchable on-line Thesaurus (English only).
• Dictionary.com - Fully searchable on-line Dictionary (English only).

Encyclopedias:

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• Encyclopedia.com - More than 14,000 articles from The Concise Columbia Electronic Encyclopedia, Third Edition have been assembled to provide free, quick and useful information on almost any topic.
• Britannica.com - The complete enyclopedia online - for free.
• MSN Encarta - Free on-line enycylopedia. Also features a dictionary and world a atlas.
• Columbia Encyclopedia, Sixth Edition - Not only is the Columbia Encyclopedia, 6th edition the largest one-volume general encyclopedia available, its year 2000 publication date makes it the most timely and up-to-the minute encyclopedic reference source available. With over 50,000 article entries, 40,000 bibliographic citations, and over 80,000 cross-reference entries, the Columbia Encyclopedia, 6th edition contains much more data than many multi-volume encyclopedias. (Free & Fully searchable)

Translation Services:

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• FreeTranslation.com - The single click translator online or download versions. Translation into 12 languages. Includes currency conversions and more.
• Babylon.com - An easy-to-use site for rapid translations where you can get the "gist" of foreign language text and web pages.

Atlas:

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• Altapedia Online - Contains full color physical and political maps as well as key facts and statistics on countries of the world.

Learn Sign Language:

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• American Sign Language (ASL) Browser - Michigan State University's ASL Browser web site, an online American Sign Language (ASL) browser where you can look up video of thousands of ASL signs and learn interesting things about them.