I found this easy to use listing of free open courseware today (dated 2007). If the links are dead at least you know what the college is, google it and I'm sure you will find the new, current URL.
Top 10 Universities With Free Courses Online by Jimmy Ruska
Any person of any age can use these. Homeschoolers in high school may find them useful.
I have been using some source material from some of these courses to guide me to good books to use when developing custom courses for my ninth grader. I am still working to develop a thorough "History of Comic Books and the Graphic Novel Storytelling Format" which relies not on teacher lectures delivered by me but uses either books as teachers, online text articles written by subject matter experts, or video lectures. I am also trying to determine reasonable assignments to go along with the course so it is not just a read and learn course.