40 – Khan Academy

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The Khan Academy contains a carefully structured series of educational videos offering complete curricula in Maths and, now, Science, Economics and Finance & Computing.

Website:  www.khanacademy.org
Cost: Free
Availability: Online
YEARLY RANKINGS
2014:
 40
2013: 41
2012: 56
2011: 74
2010: –
2009: –
2008: –
2007: –

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

“I don’t necessarily use it with my students, but it helps me know how to teach things different” Diane Lowery 2014

“support of flipped mastery classroom” 2014
“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