Coursera - Top university courses online for anyone to take, for free.
edX - Explore free courses from leading universities.
Udacity - Higher Education for Free
udemy - Online courses form the World's Experts
Apple - iTunes U (requires iTunes to view on PC)
StraighterLine - The shortest distance between you and your degree.
Founded in 2010, StraigherLine offers a low-cost, subscription-based service that allows students to take a variety of accredited, general-ed courses online.
2U Inc. partners with preeminent institutions of higher education to deliver rigorous, selective degree programs online to students globally. Beginning in the fall of 2013, Semester Online, will offer undergraduate students the opportunity to take rigorous, online courses for credit from a consortium of universities.