WordWeb is a free dictionary and thesaurus program for Windows to get the pronunciation, synonyms, antonyms, verbs, adjectives, adverbs & nouns of a word.

Small popup application Dictionary.Net looks things up on Google so you don't have to.

The days of consulting a worn dog-eared print dictionary seem to be behind us now. Nice desktop alternatives such as WordWeb make us miss them a little less.

Lingoes is a free dictionary and text translator software for Windows. It also includes currency converter, time zone converter, international dialing codes, measurements converter, etc.