Khan Academy a free education for anyone anywhere

The 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 to 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. The Khan Academy's materials and resources are available to you completely free of charge.

Students can make use of our extensive video library, practice exercises, and assessments from any computer with access to the web.

Complete custom self-paced learning tool
A dynamic system for getting help
A custom profile, points, and badges to measure progress

Coaches, parents, and teachers have unprecedented visibility into what their students are learning and doing on the Khan Academy.

Ability to see any student in detail
A real-time class report for all students
Better intelligence for doing targeted interventions

Source: http://www.khanacademy.org Sharing is sexy