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.

Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.

Eduflow - Digital learning that actually teaches students something

Eventbrite - Discover Great Events or Create Your Own & Sell Tickets

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

Bigtent - BigTent is a web-based organization and communication portal for groups.