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"Below is a list of freely available online mathematics, data analysis and graphing resources. * The Interactive Library: Math - This EdInformatics.com site is a list of links to interactive integrated math and science sites. Some Java applets are standalone and some come with lesson plans and notes * The Interactive Library: Calculators - This EdInformatics.com site is a list of links to interactive calculators including a Roman numerals calculator, a graphing applet, a virtual abacus and a scientific conversions applet * Create a Graph - Graph data online * GraphPad - Graph data online The following math and data analysis resources are available for a fee. Commercial products * InspireData - Not an interactive site, but a nice data analysis software tool, by the developers of Inspiration and Kidspiration. You can download a free 30-day trial"

A useful web-based calculator with graphical functions and lots more. You can also embed it on your site

Maths graphic  calculator

This is excellent for showing transformations of functions clearly on the screen - need to investigate other resources