Bookfinder - Find nearly any book: new, used, rare and textbooks.
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.
AbeBooks - AbeBooks has millions of new & used books, rare books and out of print books.
Clever - syncing between education applications for K-12 schools
BetterWorldBooks - New & Used Books for Sale, Textbooks, Book Reviews & more - FREE SHIPPING
Claroline - Claroline is a collaborative eLearning and eWorking platform.