Geogebra is free and open source:

Download it here: http://www.geogebra.org/cms/

Get resources from here: http://www.geogebratube.org/

Workshop 2012 http://2011geogebralessons.wikispaces.com/Geogebra+Workshop+July+2012

My classes 2012 http://2012maths.wikispaces.com/

My Geogebra Applet links: http://gapplets.wikispaces.com/

My Applets 2011: http://2011maths.wikispaces.com/Applets

Presentation 5th December 2011 Calc Day 2011

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