Open edX is the open-source (AGPL) platform software for MOOC developed by EdX.
Lots of websites are powered by Open edx, especially edx and fun (France Université Numérique).
A list is available here : https://github.com/edx/edx-platform/wiki/Sites-powered-by-Open-edX
Course instructor choose their license for content.
#Using API You Must register with the Open edX server with Oauth 2.0 Documentation : https://edx.readthedocs.io/projects/edx-platform-api/en/latest/courses/index.html
it's use Xblocks and we can get them with the API. List of Xblocks is available here : https://openedx.atlassian.net/wiki/display/COMM/XBlocks+Directory