Glosbe - Huge collaborative massively multilingual dictionary.
GoldenDict - The program has the following features: Use of WebKit for an accurate articles' representation, complete with all formatting, colors, images and links.
VerbAce - VerbAce-Pro is an easy-to-use Desktop Translation Software. Translate in a mouse click
Google Translate - Google's free service instantly translates words, phrases, and web pages between English and over 100 other languages.
Visuwords - The fun and free way to look up definitions. THE graphical dictionary and visual thesaurus.
PONS - Germany’s most-trusted foreign-language dictionary. Includes language-learning materials, definitions, examples, pronunciation tips and a vocabulary trainer.