Free World-Class Education for Anyone Anywhere

About:
"Khan Academy is an organization on a mission. We're a not-for-profit with the goal of changing education for the better by providing a free world-class education for anyone anywhere.

All of the site's resources are available to anyone. It doesn't matter if you are a student, teacher, home-schooler, principal, adult returning to the classroom after 20 years, or a friendly alien just trying to get a leg up in earthly biology. Khan Academy's materials and resources are available to you completely free of charge." Start learning today!

Other great sites where you can learn how to program, build websites, iPhone apps and much more:

1. Code.org 
2. Treehouse
3. Codecademy