Teachable - Create and sell beautiful online courses with the platform used by the best online entrepreneurs to sell $100m+ to over 4 million students worldwide.
MediaWiki - MediaWiki is a free software wiki package written in PHP, originally for use on Wikipedia.
Clever - syncing between education applications for K-12 schools
TiddlyWiki - a non-linear personal web notebook
Claroline - Claroline is a collaborative eLearning and eWorking platform.
Confluence - Confluence is content collaboration software that changes how modern teams work