Coursera partners with 33 top universities in the world to offer courses online for anyone to take, for free.
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Founded by Harvard University and the Massachusetts Institute of Technology, edX features learning designed specifically for interactive study via the web.
From Microsoft Office and email to reading, math, and more, GCFLearnFree.org offers more than 90 tutorials, including more than 1,000 lessons, videos, and interactives, completely free.
Khan Academy offers a library of over 3,000 videos covering everything from arithmetic to physics, finance, and history, as well as hundreds of other skills.
MIT OCW is a web-based publication of virtually all MIT course content. OCW is open and available to the world and is a permanent MIT activity.
Founded by a Stanford computer science professor, Udacity focuses on computer science and related fields.