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.
EduDo - EduDo is a video discussion platform
Drops - Visual language learning.
Courseroot - Biggest online course database on the web
Clozemaster - Learn a language through mass exposure to useful vocabulary in context.
TeenUp - A learning platform designed for teens by teens