edX
edX is one of the top learning platforms to motivate students. edX, founded by MIT and Harvard University, provides university-level courses in a variety of subjects to students all around the world.
edX's tagline is "grow your career, enhance your life," and it seeks to help students develop their skills, knowledge and master fields like business management, biology, and computer programming. There're many free courses available on this site as Python, Data Science, Computer Science, Programming, Frontend Development, and more. You can attend a 9-week course called "Introduction to Computer Science and Programming Using Python" taught by an MIT professor, or a 1-11-week course called "Project Management" taught by Rochester Institute of Technology.
Most Popular Subject: UX design
Users: 10 million registered
Website: https://www.edx.org/