DICTIONARIES

FOREIGN LANGUAGES

American Heritage Dictionary
Cambridge Dictionaries Online
Merriam-Webster Dictionary
One Look Dictionaries
yourDictionary.com
Dictionary.com
FreeDictionary.com

Thesaurus.com
Roget's Thesaurus
Dictionary of Difficult Words
Merriam-Webster's Word Central
Homophone Dictionary
Language Links (grammar, etomologies, etc.)
World Wide Words
PseudoDictionary - Slang, Webspeak, etc.
The Glossarist (glossaries on a range of topics)

(includes French language materials)

Internet Picture Dictionary (multilingual)
Online Dictionaries (150 foreign languages)
Lexicool Bilingual & Multilingual Dictionaries
Transparent Language
Travlang's Translating Dictionaries
Xlation 1600 glossaries & 60+ online grammars
WordReference.com (bilingual dictionaries)
Word 2 Word Online Dictionaries & Translators
yourDictionary.com

Fonetiks Online (Foreign Language Pronunciation)