Shutterstock.github.com/rickshaw/ Graphing Toolkit Rickshaw provides the elements you need to create interactive graphs: renderers, legends, hovers, range selectors, etc.
You put the pieces together. See Demo → Built on d3.js It's all based on d3 underneath, so graphs are drawn with standard SVG and styled with CSS. Modernizr. JSON Visualization. CSS-Tricks. HTML5 Rocks - A resource for open web HTML5 developers. Spend your time innovating, not replicating. CoffeeScript.
LESS « The Dynamic Stylesheet language. CodeKit — THE Mac App For Web Developers.