Reddit - Reddit gives you the best of the internet in one place. Get a constantly updating feed of breaking news, fun stories, pics, memes, and videos just for you.

Teachable - Create and sell beautiful online courses with the platform used by the best online entrepreneurs to sell $100m+ to over 4 million students worldwide.

SaidIt.net - Saidit.net - say your truth.

Clever - syncing between education applications for K-12 schools

Tildes - A non-profit community site driven by its users' interests

Claroline - Claroline is a collaborative eLearning and eWorking platform.