https://developers.google.com/chart/
http://demos.dojotoolkit.org/demos/chartTypes/demo.html
http://www.amcharts.com/
http://www.highcharts.com/
http://www.flotcharts.org/
http://www.jqplot.com/
http://ecomfe.github.io/echarts/
https://github.com/mbostock/d3/wiki/Gallery