raphael.js
two.js
angular-d3 donut chart from @vicapow: http://vicapow.github.io/angular-d3-talk/slides/#/5
vicapow donut source: https://github.com/vicapow/angular-d3-talk/tree/master/slides/demos/lets-make-a-donut-chart-directive
pie chart update II: http://bl.ocks.org/mbostock/1346410