MIT is making its entire course curriculum available for free on the internet. The only thing missing is the professor. Some of the classes that you can see have video, many have lecture notes and presentations.
The catalog has over 1800 classes and pretty much every topic area is covered.
They make a point that by using this site, you are not getting an MIT education. You're just using their materials:
MIT OpenCourseWare (OCW) is a web-based publication of virtually all MIT course content. OCW is open and available to the world and is a permanent MIT activity.
What is MIT OpenCourseWare?
MIT OpenCourseWare is a free publication of MIT course materials that reflects almost all the undergraduate and graduate subjects taught at MIT.
- OCW is not an MIT education.
- OCW does not grant degrees or certificates.
- OCW does not provide access to MIT faculty.
- Materials may not reflect entire content of the course.
You can read more in the FAQ.