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.

hackattic - No nonsense, real world programming challenges

Clever - syncing between education applications for K-12 schools

HackerRank - HackerRank is a platform that allows companies to conduct interviews remotely to hire developers and for technical assessment purposes.

Claroline - Claroline is a collaborative eLearning and eWorking platform.

Takehome - Effective and humane coding challenges for candidates