Grafico – charting library built with Raphael and Prototype.

Via Scoop.it – Awesome jQuery Tutorials

Grafico is a javascript charting library built with Raphaël and Prototype.js.   This means you get awesome graphs such as stacked area charts and sparklines, but no pie charts or bar charts with every bar a different color. Each graph type has numerous API options to customize it’s look and behavior.
Via blogfreakz.com