Grand dictionnaire terminologique
The GDT of the OQLF (Office québécois de la langue française) is a French-English / English-French dictionary online. As a language tool, the GDT is exceptionally comprehensive, especially in certain technical fields, and is constantly being updated. It may be used as a bilingual dictionary or to look up the definitions of individual words in either French or English.
http://www.granddictionnaire.com/

IATE
IATE (Inter-Active Terminology for Europe) is the European Commission’s new multilingual terminological databank and replaces the earlier tool, Eurodicautom. This language site currently enables users to find translations for 1.4 million terms in 24 European languages, including French and English.
http://iate.europa.eu/iatediff/

Lexibase Collins French-English / English-French
This new on-line dictionary service provided by Softissimo enables users to look up the reference content of the famous Collins French-English/English-French dictionary free. This dictionary contains thousands of words and phrases with translations in context, definitions, or synonyms.
http://dictionary.reverso.net/french-english/

ARTFL
This free on-line French-English dictionary from the ARTFL project (American & French Research on the Treasury of the French Language) of the University of Chicago in the United States contains approximately 75,000 terms.
http://humanities.uchicago.edu/orgs/ARTFL/.../FR-ENG.html

TV5 Monde Alexandria
TV5Monde is a French site that offers translations in combinations of 22 languages. The French-English translator gives instant definitions as well as a push-button conjugations and declensions guide to the translated word.
http://www.tv5.org/TV5Site/alexandria/definition.php

French Linguistics
On the French Linguistics web site you’ll find a Franco-English dictionary containing about 36,000 words, 20,000 compounds and idioms and 88,000 translations, as well as a bilingual dictionary for computing and web vocabulary.
http://www.french-linguistics.co.uk/dictionary/

WordReference
The WordReference web site offers a free on-line dictionary with translations of words from French to English, as well as a unilingual English dictionary to look up a word’s definition. This French dictionary has over 250,000 translations.
http://wordreference.com/

Institut des Sciences Cognitives
This English-French dictionary, jointly prepared by the ISC and the CNRS (Centre National de la Recherche Scientifique) in France operates as translation software.
http://dico.isc.cnrs.fr/dico/tr/chercher_fr

Freedict
Freedict French-English dictionary provides instant translation of English words and phrases up to 49 characters long. It includes links to other sites of interest about France, as well as freedict.com online translators for other languages.
http://www.freedict.com/onldict/fre.html

LookWAYup
LookWAYup is a large online dictionary that translates French terms to English. It tolerates small spelling errors, shows full definitions (in English) for multiple senses of the word, and for each sense shows synonyms, related terms, and usage examples. It can also be installed on browsers, web sites, PDAs, and mobile phones.
http://lookwayup.com/free/FrenchEnglishDictionary.htm

Logos
Logos bills itself as the largest freely accessible multilingual dictionary on the web, with dictionaries in 232 languages. French words and phrases can be translated into English at the touch of a button. Logos also features a universal conjugator, children’s dictionary, and more than 43,000 online books in over 100 languages, 2,664 in French.
http://www.logos.it/

Sylang
Sylang offers a free access French-English dictionary on-line containing 75,000 words.
http://dict.sylang.com/

Dicts
This French-English dictionary translates words from both languages instantly, and allows the user to type in just part of a word to find all possible matches. The site also features a picture dictionary.
http://dicts.info/ud.php?l1=French&l2=English

Ectaco
This site offers instant translations of French and English words. This free French-English dictionary contains 400,000 words.
http://www.ectaco.co.uk/English-French-Dictionary/

From Language to Language
The free online From Language to Language translation dictionary offers bi-lingual definitions in combinations of 18 different languages in one translating tool. Multiple words may be searched simultaneously by using commas.
http://www.langtolang.com/

WinDi
WinDi offers free translation services with linguistic functions in 7 languages (21 language pairs and 42 possible directions), free access to dictionaries, spelling, conjugation, grammar, voice and sentence search engine.
http://www.windi7.com/index_all.php

DicovoX Audio Dictionary
The website of the Language Technology Laboratory (LATL) of the University of Geneva in Switzerland provides an audio dictionary translating words from French to English. It is equipped with speech output, enabling users to listen to pronunciations.
http://www.latl.unige.ch/english/latl_e.html

French-English Medical and Social Dictionary
The International Index and Dictionary of Rehabilitation and Social Integration (IIDRIS) is a Franco-Quebecois project implemented by the Rehabilitation and Social Integration Terminology and Computer Laboratory (LITRIS) of the Quebec Rehabilitation Institute of Physical Disabilities (IRDPQ) in Canada, and the Medical Informatics Laboratory of the Medicine Faculty of the University of Rennes-1 in France. It is a technical and scientific dictionary bringing together terms from different disciplines of medicine or health, and vocabulary linked to the social sector. The tool is trilingual –French/English/Spanish– and can be consulted free on-line.
http://www.med.univ-rennes1.fr/iidris/index.php

Environment Dictionary
The Dictionnaire Environnement web site provides a free specialist dictionary French - English, with over 23,700 translations of technical environmental terminology.
http://www.dictionnaire-environnement.com/dico_env_en.php

Beyond Gastronomy Dictionary
This web page presents a specialist French-English bilingual dictionary for free look-up on-line. It brings together terms from catering, gastronomy and food products.
http://www.provencebeyond.com/a/french.html

Dictionary of petroleum and natural gas terms
The French-English Dictionary of petroleum and natural gas terms is kindly provided by LingInfo, a company specialized in technical translations for petroleum industry. The dictionary contains about 95 000 terms related to the development of oil and gas fields.
http://www.pngis.net/dictionary/