#6 Coursera

The site says, “We are a social entrepreneurship company that partners with the top universities in the world to offer courses online for anyone to take, for free. We envision a future where the top universities are educating not only thousands of students, but millions. Our technology enables the best professors to teach tens or hundreds of thousands of students.”

Coursera offers courses in engineering, humanities, medicine, biology, social sciences, mathematics, business, computer science, and other areas.

Classes offered on Coursera are designed to help you master the material. When you take one of the classes, you will watch lectures taught by world-class professors, learn at your own pace, test your knowledge, and reinforce concepts through interactive exercises. With Coursera, you'll also join a global community of thousands of students learning alongside you.

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