Free online college courses are available from the Massachusetts Institute of Technology, Carnegie Mellon University, the University of California Berkeley and Stanford University. The online educational organization Khan Academy also offers free online courses.
MIT offers an online archive of courses that were taught on campus in the past. Some classes can only be followed if the student also purchases the textbook.
Carnegie Mellon University also provides several online courses. While MIT has a larger selection, Carnegie Mellon's core classes are presented in a user-friendly format and closely resemble an on-campus course.
UC Berkeley features a portal of videos and audio files on its website for popular ongoing courses as well as an archive of courses given in the past. Text materials are not included, but the lectures are clear and straightforward. Stanford University also provides several lectures and courses on iTunes in the iTunesU section that are free to access.
In its collection of web-only courses, Khan Academy provides over 1,000 videos that teach mostly math concepts, many of which are taught at university levels. Courses from the Open University in the United Kingdom are available to LearningSpace users. Open University has an a policy of open enrollment for students of all kinds, and it offers its content online in a well-planned and user-friendly layout.