Khan Academy - Khan Academy offers online tools to help students learn about a variety of important school subjects. Tools include videos, practice exercises, and materials for instructors. Read more about Khan Academy.
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.
Calcohol - Need to dilute alcohol? How fast water start to boiling?
Clever - syncing between education applications for K-12 schools
HappyCoding - Simplify your iOS & macOS development.
Claroline - Claroline is a collaborative eLearning and eWorking platform.