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.
SwiftBites - Learn how to code in swift with interactive mini lessons
Magiclingua - Speak a new language with confidence
udemy-dl - Download courses from Udemy for personal offline use
Cambly - Private language tutors on demand.
Flowlingo - Get fluent in a language through content immersion