Free courses from MIT. No registration required.

[Vaughn Hill]

Free lecture notes, exams, and videos from MIT.
No registration required. You may not receive credit but if you only take courses to get credit then this isn't for you.

http://ocw.mit.edu/index.htm


Here are some of the free courses. http://ocw.mit.edu/courses/

[James H. Bushart]

Same here.