Public - Group chats.
PowerSchool - PowerSchool provides a K-12 education technology platform for operations, classroom, student growth, and family engagement.
chitchat - Chat Room with Selfies and Pagers (yes, pagers!)
Clever - syncing between education applications for K-12 schools
Slack - A messaging app for teams who see through the Earth!
Claroline - Claroline is a collaborative eLearning and eWorking platform.