Google Translate - Google's free service instantly translates words, phrases, and web pages between English and over 100 other languages.
Mate Translate - Ultimate translation app for Mac, iOS, Chrome and many more
MacLinguist - A pop-up translator for Mac and Windows that works with any application
Spanish to English - Instant Spanish to English translation. Thousands words and phrases available!
TransKey – Chat Translator App - TransKey – Chat Translator App is a rich-featured keyboard extension, enabling you to translate your messages inside any social media application like WhatsApp, iMessage, Facebook, Email, Twitter, Instagram, and many others.
Linguee - English Dictionary and Translation Search with 1,000,000,000 example sentences from human translators. Languages: English, German, French, Spanish, and Portuguese