http://oli.cmu.edu/
The Carnegie Mellon University Open Learning initiative is a service that offers free online courses. These courses are taught by qualified educators who aim to fuse research, high quality courses, and student and instructor feedback to improve secondary education.
http://www.open.edu/openlearn/
OpenLearn provides free educational resources and sample courses to all registered students.
Harvard University
http://www.extension.harvard.
The Harvard Extension School provides students with an opportunity to take courses, earn certificates, or work toward a degree.
Queen's University Belfast
http://www.qub.ac.uk/schools/
Queens University Belfast’s Open Learning Program offers a wide variety of part-time courses that are open to all adults, regardless of qualifications or experience. These courses are offered during the day, evenings and weekends and 3 programs are available each academic year.
University of Guelph
http://www.open.uoguelph.ca/
The Open Learning program at the University of Guelph is a distance-only mode of study that provides individuals with access to degree-credit university courses. These courses are for individuals who are interested in personal enrichment, professional updating, or eventual application to a degree program.
Coursera
Coursera offers free online courses from some of the top universities in the world with certificates available upon completion of some courses.
Yale University
Open Yale Courses are open, free introductory courses that are taught by Yale teachers and Scholars.
Stanford University
The site provides a variety of learning options. There are 16 free classes.