"Offers free online video courses and academic lectures from the world's top universities. It is considered a search engine for full-text scholarly information, with video courses covering around 50 primary subject disciplines.”

"A world-wide online learning platform founded in 2012 by Stanford computer science professors Andrew Ng and Daphne Koller that offers massive open online courses (MOOCs), specializations, and degrees."

A partnership between Harvard University and the Massachusetts Institute of Technology, EdX offers access to nearly 3,000 MOOCs and interactive online courses from top universities in subjects from history to science to business.

Since 2001, all of the Massachusetts Institute of Technology's courses are available online for free.

“A collection of expertly developed educational materials – including textbooks, syllabi, course activities, readings, and assessments – in 81 high-enrollment college courses. 42 courses have been completed so far, providing faculty with a high-quality, affordable option that will cost students no more than $30 for textbooks. All materials are shared under a Creative Commons (CC BY) license unless otherwise noted."

“All lectures were recorded in the Yale College classroom and are available in video, audio, and text transcript format. Registration is not required and no course credit is available.”