Use these links to find free information on the web:
Dictionaries and Thesauruses
American Heritage: http://www.bartleby.com/61/s0.html
Cambridge Dictionaries: http://dictionary.cambridge.org/
Dictionary.com: http://dictionary.reference.com/
Merriam Webster: http://www.m-w.com/dictionary.htm
MSN Encarata: http://www.wordiq.com/dictionary/
One look: http://www.onelook.com/
Oxford: http://dictionary.oed.com/
Word I Q: http://www.wordiq.com/dictionary/
Wordsmith: http://www.wordsmyth.net/
Your Dictionary: http://www.yourdictionary.com/
Info Please: http://www.infoplease.com/dictionary.html
Encyclopedias
Brittanica: http://www.britannica.com/
Columbia: http://www.bartleby.com/65/
Encyclopedia.com: http://www.encyclopedia.com/
Info Please: http://www.infoplease.com/dictionary.html
MSN: http://encarta.msn.com/encnet/refpages/artcenter.aspx
Webster's: http://humanities.uchicago.edu/orgs/ARTFL/forms_unrest/webster.form.html
Wikipedia: http://en.wikipedia.org/wiki/Main_Page
World Atlas (Maps)
MSN http://encarta.msn.com/encnet/features/dictionary/dictionaryhome.aspx
History
American History: http://www.historyplace.com/
Biographical Dictionary: http://www.s9.com/biography/
Hyperhistory: http://www.hyperhistory.com/online_n2/History_n2/a.html
Info Please: http://www.infoplease.com/dictionary.html
Ancient Greeks: http://www.arwhead.com/Greeks/