SwiftBites - Learn how to code in swift with interactive mini lessons
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.
udemy-dl - Download courses from Udemy for personal offline use
Busuu - Join the global language learning community, take language courses to practice reading, writing, listening and speaking and learn a new language. Learn English with busuu's .
Flowlingo - Get fluent in a language through content immersion
Drops - Visual language learning.