Typora - A minimal Markdown reading & writing app.
PowerSchool - PowerSchool provides a K-12 education technology platform for operations, classroom, student growth, and family engagement.
Dillinger - joemccann has 95 repositories available. Follow their code on GitHub.
Clever - syncing between education applications for K-12 schools
StackEdit - Full-featured, open-source Markdown editor based on PageDown, the Markdown library used by Stack Overflow and the other Stack Exchange sites.
Claroline - Claroline is a collaborative eLearning and eWorking platform.