An OpenCourseWare (OCW) is a free and open digital publication of high quality college and university‐level educational materials. These materials are organized as courses, and often include course planning materials and evaluation tools as well as thematic content.
https://ocw.mit.edu/
https://www.extension.harvard.edu/open-learning-initiative
www.openuniversity.edu/courses
oyc.yale.edu/
www.openculture.com/freeonlinecourses
https://www.edx.org/
https://www.coursera.org/
https://www.open2study.com/courses
www.open.edu/openlearn/free-courses
www.myopencourses.com/