Coursera works with universities and other organizations to offer online courses, specializations, and degrees in a variety of subjects, such as engineering, …

Khan Academy is a non-profit educational organization.

SoloLearn provides coding tutorials mainly through its mobile app.

Udacity is a for-profit educational organization offering massive open online courses (MOOCs).

Wikibooks (Wikimedia Free Textbook Project and Wikimedia-Textbooks) is a wiki-based Wikimedia project hosted by the Wikimedia Foundation for the creation of f…

edX is a massive open online course (MOOC) provider. It hosts online university-level courses in a wide range of disciplines to a worldwide student body, incl…

OpenCourseWare Consortium provides opensource cources.

TED-Ed is an online QnA site.

Udemy.com is an online learning platform. It is aimed at professional adults who want to add new skills to their resumes, or explore their passions.

Wikiversity is a Wikimedia Foundation project devoted to learning resources, learning projects, and research for use in all levels, types, and styles of educa…