Google Classroom - Learning management tool by Google
newrow - Create your online school and deliver interactive content.
Edmodo - Where Learning Happens
PowerSchool - PowerSchool provides a K-12 education technology platform for operations, classroom, student growth, and family engagement.
schoology - An online learning, classroom management & social networking platform that provides educators & students w/ more effective, efficient & engaging ways to learn.
Clever.com - syncing between education applications for K-12 schools