EdX hosts online university-level courses in a wide range of disciplines to a worldwide student body, including some courses at no charge.
The Massachusetts Institute of Technology and Harvard University created edX in May 2012 and feature more than 70 schools, nonprofit organizations, and corporations that offer courses ranging from AI to Womens Studies, from Government to Happiness Studies.
For more information visit the official website at https://www.edx.org/
Anyone can join
$ - $$$
Courses range from no cost to upwards of 600 USD.
Technical skill required varies by course.
Typically 1-3 hours per week; varies by course.
Further information at https://www.edx.org/