Google Translate - Google's free service instantly translates words, phrases, and web pages between English and over 100 other languages.
MacLinguist - A pop-up translator for Mac and Windows that works with any application
Mate Translate - Ultimate translation app for Mac, iOS, Chrome and many more
Crowdin - Localize your product in a seamless way
Linguee - English Dictionary and Translation Search with 1,000,000,000 example sentences from human translators. Languages: English, German, French, Spanish, and Portuguese
Crow Translate - A simple and lightweight translator that allows to translate and speak text using Google, Yandex and Bing.