HTML PIE CHART

I like this one the best…..

http://www.chartjs.org/
http://www.google.com/#bav=on.2,or.&fp=71fb22bf9b90f16b&q=javascript+charts+library+open+source

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http://socialcompare.com/en/comparison/javascript-graphs-and-charts-libraries

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JFreeChart

JFreeChart Google Search

http://www.liquidx.net/plotkit/

http://www.smashingapps.com/2011/08/26/45-free-online-tools-to-create-charts-diagrams-and-flowcharts.html

http://www.mattblagden.com/Blog/Post/Pie_Charts_in_HTML_4

http://www.hongkiat.com/blog/22-useful-chart-graph-diagram-generators/

http://www.multicians.org/thvv/pie-chart.html