With the Sensei plugin you can create courses, write lessons, and add quizzes into WordPress.
http://www.woothemes.com/products/sensei/
Frameworks · WordPress Theme
Get access to data on 21,686 websites that are Sensei Customers. We know of 5,260 live websites using Sensei and an additional 16,426 sites that used Sensei historically and 2,982 websites in the United States.
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Get a list of 21,686 websites using Sensei which includes location information, hosting data, contact details, 5,260 currently live websites and an additional 5,884 domains that redirect to sites in this list. 16,426 sites that used this technology previously and 2,982 websites in the United States currently using Sensei.