Dictionaries
Online Dictionary - http://dictionary.die.net/
Find free cross-referenced definitions, spelling correction, and word searches from WordNet, Webster's, FOLDOC, and a variety of specialized sources.
Thesaurus.com - http://www.thesaurus.com/
The largest and most trusted free online thesaurus. Quickly find accurate and up-to-date synonyms, antonyms, and related words.