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 20,345 websites that are Sensei Customers. We know of 4,579 live websites using Sensei and an additional 15,766 sites that used Sensei historically and 2,608 websites in the United States.
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Get a list of 20,345 websites using Sensei which includes location information, hosting data, contact details, 4,579 currently live websites and an additional 5,384 domains that redirect to sites in this list. 15,766 sites that used this technology previously and 2,608 websites in the United States currently using Sensei.