Class Central
https://www.class-central.com/

Academic Earth
http://academicearth.org/

ALISON
https://alison.com/

Canvas Network
https://www.canvas.net/

Coursera
https://www.coursera.org/

edX
https://www.edx.org/

FutureLearn
https://www.futurelearn.com/

Harvard University Online Learning
http://online-learning.harvard.edu/

Lynda.com
https://www.lynda.com/

MIT Video
https://ocw.mit.edu/index.htm

Saylor.org Academy
https://www.saylor.org/

Udacity
https://www.udacity.com/

Udemy
https://www.udemy.com/courses/