GoldenDict - The program has the following features: Use of WebKit for an accurate articles' representation, complete with all formatting, colors, images and links.
Glosbe - Huge collaborative massively multilingual dictionary.
Dictionary.com - Dictionary.com is the world’s leading digital dictionary. We provide millions of English definitions, spellings, audio pronunciations, example sentences, and word origins.
VerbAce - VerbAce-Pro is an easy-to-use Desktop Translation Software. Translate in a mouse click
WordReference - WordReference is a free online Oxford dictionaries for Spanish, French, Italian, German and more.
Visuwords - The fun and free way to look up definitions. THE graphical dictionary and visual thesaurus.