Duolingo - Duolingo is a free language learning app for iOS, Windows and Android devices. The app makes learning a new language fun by breaking learning into small lessons where you can earn points and move up through the levels. Read more about Duolingo.
Google Translate - Google's free service instantly translates words, phrases, and web pages between English and over 100 other languages.
Zorbi - Spaced-Repetition Flashcards - Other tools are built by boomers, Zorbi is built by students.
Lingvanex Translator for Slack - Auto-translate messages, documents and images in Slack
SmartCards+ - Spaced Repetition Software for iOS. Modern, powerful and easy to use.
Inspector Spacetime from Google - Google Translate for engineers working with motion