"Code.org® is a nonprofit dedicated to expanding access to computer science in schools 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, just like biology, chemistry or algebra. Code.org organizes the annual Hour of Code campaign which has engaged 10% of all students in the world and 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 Amazon, Facebook, Google, the Infosys Foundation, Microsoft, and many more."
Personal Note: I don't know how I missed posting this one until now. Used by most Tech instructors, if you have not added at least some portion of their website into your curriculum you need to do so.