Some of the most important Universities in the World are providing free online courses, in many line of business or studying. The idea is spread the knowledge, so in some cases your can get or not the certificate of conclusion.
For example, MIT - Massachusetts Institute of Technology has in its homepage, hundred of courses in many areas like economy, technology, antropology, music, biology, Athletics, Physical Education and Recreation, and son on...
The professor Salman Khan, graduated in Harvard, has a website with an extensive video library, trainning many peopleo around the world.
Check the links below and enjoy yourself!
MIT Courses: http://ocw.mit.edu/courses/
Prof. Khan: http://www.khanacademy.org/
OCW Courses: http://www.ocwconsortium.org/
