Academic Earth

Founded in 2009, Academic Earth exists to provide access to world-class education resources to anyone who wants to learn. They make the claim that theirs is the first resource of its kind. It functions like some of the other sites on this list, offering a wide range of courses from some of the world’s top schools.

They also have a very user-friendly search engine that allows you to zero in on the courses that fit your education goals, and they provide a portal for finding certificate and degree programs for both physical and online schools.