Foxit Reader - Foxit Reader is a free and light-weight multi-platform PDF document viewer.
PowerSchool - PowerSchool provides a K-12 education technology platform for operations, classroom, student growth, and family engagement.
PDFZen - The powerful, simple, free online PDF editor for the masses; free yourself from the fax machine!
Clever - syncing between education applications for K-12 schools
Xodo - Try easy-to-use PDF tools that keep your documents safe. Work with your important files across all platforms and devices with the ultimate all-in-one document solution. Your productivity lives at Xodo!
Claroline - Claroline is a collaborative eLearning and eWorking platform.