PowerSchool - PowerSchool provides a K-12 education technology platform for operations, classroom, student growth, and family engagement.
ERDLab - ERDLab | Entity-Relationship Diagram Tool for Professionals
Clever - syncing between education applications for K-12 schools
Airforms - Got a database?
Claroline - Claroline is a collaborative eLearning and eWorking platform.
Google Forms - Simple web forms from Google.