PowerSchool - PowerSchool provides a K-12 education technology platform for operations, classroom, student growth, and family engagement.
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!