D3 JavaScript Graph Chart Donut Pie Visualization Library for HTML and SVG

D3 is one of the best JavaScript libraries I have found for vizualizing data.

D3 Data Driven Documents

D3.js is a JavaScript library for manipulating documents based on data. D3 helps you bring data to life using HTML, SVG and CSS. D3’s emphasis on web standards gives you the full capabilities of modern browsers without tying yourself to a proprietary framework, combining powerful visualization components and a data-driven approach to DOM manipulation.

https://github.com/mbostock/d3/wiki/Gallery 

http://d3js.org/

 

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