On e-learning platforms like edX, Coursera, and FutureLearn, you can take thousands of online courses led by accredited universities, from computer programming fundamentals to neuroscience.
To narrow down all the free options, we outlined the most popular online classes from the top 21 universities, as ranked by US News.
We determined popularity by the highest number of current enrollments and included courses that are part of longer certificate programs (as you can still audit them for free).
(Note: We omitted the University of California, Los Angeles, and the University of California, San Francisco from this list because don't offer online classes through these platforms.)
The most popular online courses from 21 of the best colleges: