Alcamy - Free, open self-learning platform. Learn & teach anything.

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

Eduflow - Digital learning that actually teaches students something

Golden - Mapping all human knowledge

Backchannel Chat - Backchannel Chat is best in class discussion tool that is intended for teachers to streamline their class activities.