Google Translate - Google's free service instantly translates words, phrases, and web pages between English and over 100 other languages.
Linguee - English Dictionary and Translation Search with 1,000,000,000 example sentences from human translators. Languages: English, German, French, Spanish, and Portuguese
Mate Translate - Ultimate translation app for Mac, iOS, Chrome and many more
Spanish to English - Instant Spanish to English translation. Thousands words and phrases available!
Bubble Translate - A mac menu bar app for translating
BabelNet - The largest multilingual encyclopedic dictionary and semantic network