Academic Earth Scroll down the page and look for the link "Find Online Courses By Subject" to see what courses are listed.
Coursera was founded by Stanford computer science professors Andrew Ng and Daphne Koller. Originally launched with partners Stanford, Michigan, Penn, and Princeton, many other universities have since joined. It is a for-profit educational company.
edX Harvard, MIT, and UC Berkeley offer courses in edX. MITx courses offer "certificates" that will bear the name of the not-for-profit overseeing the edX program, not MITs.
The Internet Archive provides an archive for free/open courses.
iTunes U from Apple.
Lumen Learning Hosted by Lumen Learning, this catalog contains community-developed OER courses.
My Education Path lists more than 15,000 courses
Oxford offers free but limited video course broadcasts.
Saylor Academy According to Inside Higher Ed, the Saylor Foundation worked with Excelsior and Straighterline to provide an indirect way for students to get college credit for their courses. Interestingly, Excelsior College has partnered with Pearson in their Uexcel credit by exam system.
Stanford Online offers free courses but some do come with fees.
Meriam Library | CSU, Chico