Chegg - Save $$ on textbooks. Rent, buy or sell your books today and get 24/7 homework help when you need it with Chegg Study and Chegg Tutors.
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.
StuDocu - StuDocu is a document collaboration platform for students.
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Claroline - Claroline is a collaborative eLearning and eWorking platform.