Open source, free to use and you get the source code to fiddle with!
I strongly suggest you buy a copy of this book:
It shows you (with pictures) how construct a nice web page with charts,
tables and diagrams. This book inspired a lot of Open Flash Chart :-)
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Get the actionscript and build the chart
Build a library to take data and output a JSON file
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Adverts:
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Open Flash Chart logo by numb.me.uk. | Syntax highlights are by GeSHi