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.
skribbl - Word guessing based on drawing.
Clever - syncing between education applications for K-12 schools
LetsDraw.It - Guess and Draw, Drawing Battle, Pictionary, Copy picture - online drawing games where you can compare your skill with others.
Claroline - Claroline is a collaborative eLearning and eWorking platform.
gartic.io - Draw, guess, and win!