edX complies courses from respected and well known universities such as Harvard and Boston University

Code.org is a non-profit organization and eponymous website led by Hadi and Ali Partovi that aims to encourage people, particularly school students in the United States, to learn computer science.

Codecademy is an American online interactive platform that offers free coding classes in 12 different programming languages

Scratch is a high-level block-based visual programming language and website aimed primarily at students as an educational tool for programming.

Khan Academy goal is creating a set of online tools that help educate students. The organization produces short lessons in the form of videos. Its website also includes supplementary practice exercises and materials for educators.

Tynker is the world's leading K-12 creative coding platform, enabling students of all ages to learn to code at home, school, and on the go.