Code.org

" Code.org® is a non-profit dedicated to expanding access to computer science and increasing participation by women and underrepresented minorities. Our vision is that every student in every school should have the opportunity to learn computer science...provides the leading curriculum for K-12 computer science in the largest school districts in the United States. Code.org is supported by generous donors including Microsoft, Facebook, the Infosys Foundation, Google, Omidyar Network, and many more" (Code.org). Code.org has a commitment to free curriculum and open source technology.