OpenCourseWare offers undergrad and graduate level courses in everything from Aeronautics and Astronautics to Writing and Humanistic Studies. Not degree-granting, but it's free and no registration is required. Some courses available in Spanish and Portuguese. With apologies to Dr. Robotnik. I found it through his earlier post and thought it might be useful for us Monkeys.
MIT's OpenCourseWare: "a free and open educational resource for faculty, students, and self-learners around the world."