The Google Chart API

The Google Chart API lets you dynamically generate charts with a URL string. You can embed these charts on your web page, or download the image for local or offline use.
code.google.com/apis/chart

Look at some charts in the gallery.
code.google.com/apis/chart/docs/gallery

Make your own chart online using the chart wizard.
code.google.com/apis/chart/docs/chart_wizard

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