The OpenCourseWare Consortium is a collaboration of higher education institutions and associated organizations from around the world creating a broad and deep body of open educational content using a shared model.
Connexions is: a place to view and share educational material made of small knowledge chunks called modules that can be organized as courses, books, reports, etc.
Try over 600 free online courses from The Open University. Available from introductory to advanced level, each takes between 1 and 50 hours to study. Complete activities to assess your progress and compare your thoughts with sample answers.