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iTunes U, developed by Apple, is a platform which gives users access to courses offered by schools and universities worldwide.
If you need to supplement your university course -- or simply want to learn about something new -- you can use the application to search for free educational content. The platform hosts courses in a wide variety of content, including courses which issue assignments as you progress, as well as audio and visual lectures. If you use iBooks, then you can take notes and highlight important sections for review in iTunes U.
Over 600,000 courses are available.
This app is compatible with the iPhone, iPod touch, and iPad. Requires iOS 5.0 or later.
Download: Apple App Store