GOG.com - DRM-free game store, selling both new and old titles. No clients required.
PowerSchool - PowerSchool provides a K-12 education technology platform for operations, classroom, student growth, and family engagement.
itch.io - An online game marketplace and community.
Clever - syncing between education applications for K-12 schools
Epic Games - Computer game storefront that gives 88% of revenue to developers
Claroline - Claroline is a collaborative eLearning and eWorking platform.