Khan Academy
The Khan Academy is "an organization on a mission". By providing absolutely free of charge instructional videos on topics covering anything from Algebra, Banking, Biology, Calculus, Chemistry, Astronomy, Economics, History, Geometry, Physics, Statistics, etc., it aims to help anyone, be it a professional wanting to brush up on his/her skills, middle school/University student, or a person who can not otherwise afford basic education, to live up to his/her full potential.
Salman Khan, the founder of Academy, have already appeared on PBS, CNN, NBC, ABC, CBS; has been invited for talks at local schools, TED, MIT, NPR; and have been featured in Forbes' blog, just to name a few. The more recently received donation from the Gates Foundation and the prize of two million dollars from Google for winning it's Project 10 to the 100 of Ideas to change the world (selected from 150,000 submissions), have given the necessary resources to further expand this amazing project into a full blown open education movement. Today, Khan Academy team is constantly introducing, in addition to its 2100+ instructional videos, new learning tools and software to make the learning experience that much better.