Code.org

This has been developed in order for computer science to become more prevalent and easily accessible to a wider audience.
See description below from website:
Code.org® is a non-profit dedicated to expanding access to computer science in schools and increasing participation by young women and students from other underrepresented
groups. Our vision is that every student in every school has the opportunity to learn computer science as part of their core K-12 education. The leading provider of K-12 computer science curriculum in the largest school districts in the United States, Code.org also created the annual Hour of Code campaign, which has engaged more than 15% of all students in the world.
All curriculum resources and tutorials we author will forever be free to use and openly licensed under a Creative Commons license, allowing others to make derivative education
resources for non-commercial purposes. If you are interested in licensing our materials for commercial purposes, contact us. Our courses are translated for worldwide use or by speakers of different languages. Our technology is developed as an open source project.