More prestigious and well-known universities pop up on this site. While most of us will never be able to study at Stanford or Johns Hopkins University, we can still benefit from their online free tuition. Coursera places an emphasis on the sciences, although you'll also find arts courses, languages, and business topics. You will need to pay for full access, although you can also access quite a lot of the material for free. The interesting thing about Coursera is that it is even possible to earn a degree, which will be of particular interest to anyone who prefers to study online.