gRaphaël is an open source JavaScript charting library that is based on Raphaël graphics library (WRD link).

It is capable of generating both static & interactive outputs including pie, bar, line or dot charts.

gRaphaël - JavaScript Charts

The charts are created with VML & supports the most popular browsers like Firefox 3.0+, Safari 3.0+, Opera 9.5+ and Internet Explorer 6.0.

There are some beautiful demos provided including the interactive pie chart & the dot chart.

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