41 – Khan Academy

A library of over 2,600 videos (covering everything from arithmetic to physics, finance, and history) and 235 practice exercises.

Khan Academy’s popularity continues and it makes a significant jump up the list this year – of 15 places.

Website Cost Availability
 www.khanacademy.org Free Online
RANKINGS
2013 2012 2011 2010 2009 2008 2007
41 56 74 - - - -

Comments from some of those who selected Khan Academy as one of their top tools

The analytics alone are worth the time to use this site, 2014

Use these video lessons to help me flip my own classroom, 2013
Independent learning for students, 2013

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