Looking at source it seems to be Raphael.js [0]. They also use _.js [1] and Handlebars for templating [2]. So a bit of javascript, vectors, and CSS animations.

Looking at source it seems to be Raphael.js [0]. They also use _.js [1] and Handlebars for templating [2]. So a bit of javascript, vectors, and CSS animations. It does look rather nice - lot's of effort went into those graphs. [0] http://raphaeljs.com/ http://raphaeljs.com/ [1] http://underscorejs.org/ http://underscorejs.org/ [2] http://handlebarsjs.com/ http://handlebarsjs.com/