Courseroot - Biggest online course database on the web
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.
Alcamy - Free, open self-learning platform. Learn & teach anything.
Eduflow - Digital learning that actually teaches students something
Startup Stash - A curated directory of 400 resources & tools for startups
Kialo - Kialo is the platform for rational debate. Empowering reason through friendly and open discussions.