JSXGraph - the best way to visualize/plot data

JSXGraph is a cross-browser library for interactive geometry, function plotting, charting, and data visualization in a web browser. It is implemented completely in JavaScript, does not rely on any other library, and uses SVG and VML. JSXGraph is easy to embed and has a small footprint: less than 100 KByte if embedded in a web page. No plug-ins are required! Special care has been taken to optimize the performance. Starting with version 0.80 JSXGraph supports multitouch devices like the Apple iPad and devices running any browser with SVG support.