French Linguistics - One-way lookup (French-English) and downloadable educational games by Neil Coffey. - http://www.french-linguistics.co.uk/
Semantic Atlas - Translation and synonym dictionary designed by the Lyon Institute for Cognitive Sciences (CNRS - Université Claude Bernard Lyon 1). It provides a geometric model for representing the meaning of words. - http://dico.isc.cnrs.fr
Cambridge Klett Compact, French-English - From Cambridge University Press, for learners. Also in print. - http://dictionary.cambridge.org/default.asp?dict=F