GitBook - Modern Publishing, Simply taking your books from ideas to finished, polished books.
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.
MkDocs - Project documentation with Markdown.
Clever - syncing between education applications for K-12 schools
Docusaurus - Easy to maintain open source documentation websites
Claroline - Claroline is a collaborative eLearning and eWorking platform.