Dictionaries and Thesauri
English Language
Oxford
English Dictionary 2nd
edition
American
Heritage Dictionary of the English Language 4th edition
Merriam Webster
Online Dictionary & Thesaurus
Roget's II: The New
Thesaurus 3rd edition
Foreign Languages
Language Dictionaries from yourDictionary.com (variety of free
foreign language dictionaries, thesauri, and grammars)