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.
Eduflow - Digital learning that actually teaches students something
COOLPHABETS - Helping kids around the world learn their native alphabets.
Kialo - Kialo is the platform for rational debate. Empowering reason through friendly and open discussions.
Fun Learn - Games and Education & Reference
Backchannel Chat - Backchannel Chat is best in class discussion tool that is intended for teachers to streamline their class activities.