Khan Academy is a non-profit with the mission to provide a free world-class education for anyone, anywhere.
https://www.khanacademy.org

GET STARTED - CLICK THIS LINK TO LEARN HOW TO SET UP YOUR CLASSES:
https://www.khanacademy.org/coach-res/for-teachers

A Quick Start Guide for Math Teachers - click this link to download:


Additional resources - sample parent permission form, differences of child vs. regular accounts, and step-by-step video tutorials
http://www.khanacademy.org/coach-res/for-teachers

The Khan Academy is a non-profit educational website created in 2006 by educator Salman Khan, a graduate of MIT and Harvard Business School.
The stated mission is to provide "a free world-class education for anyone anywhere". Wikipedia
Founder: Salman Khan
Founded: September 2006
Assets: 1.623 million USD (2010)
Revenue: 1.826 million USD (2010)
Nonprofit category: Education
Tax deductibility code: 501(c)(3)

It's a great tool for blended learning experiences for students of all ages.

Khan Academy believes that learning is meant to be personalized, mastery-based and interactive.

KA Lite (http://kalite.learningequality.org/)
Not officially associated with Khan Academy, KA Lite is an offline version of Khan Academy that runs on almost anything.
  • Bringing the online education revolution to rural communities.
  • Synchronize and manage your organization's deployments centrally.
  • Quick installation, minimal system requirements, and simple to use.
  • Students can earn points, teacher can view coach reports.
  • Choose which videos to download, and languages for subtitles.

Another great tool that uses Khan Academy resources — Gooru
http://goorulearning.org