edX provides interactive online classes and MOOCs from some of the world's best universities, including MIT, Harvard, and Berkley. The course cover a wide variety of subjects and feature lots of student interactivity. Courses are for a specific timeframe.
1000+ Free College Courses Online (Video Tutorials) Hi, this is huge collection of 1000+ free courses online for more than 25+ subjects of your interest. Every course has full length video tutorials/lectures, some of them have assignments, lecture notes and Quizzes as well. Courses are from Ivy League universities and best colleges like MIT, Yale, UC Berkeley, NPTEL, Harvard, Stanford, McGill etc... and some are from individuals like Khan Academy and Patric Dixon.