A Master List of 1,150 Free Courses From Top Universities

The list lets you download audio & video lectures from schools like Stanford, Yale, MIT, Oxford and Harvard. Generally, the courses can be accessed via YouTube, iTunes or university web sites, and you can listen to the lectures anytime, anywhere, on your computer or smart phone.
There’s probably about 35,000 hours of free audio & video lectures here.
Enough to keep you busy for a very long time.