I second HighchartsJS. The learning curve was minimal (imho) because of the massive amount of examples with jsfiddle links to tweak the settings: http://www.hig

I second HighchartsJS. The learning curve was minimal (imho) because of the massive amount of examples with jsfiddle links to tweak the settings: http://www.highcharts.com/demo/ http://www.highcharts.com/demo/ Their API reference is pretty good as well: http://api.highcharts.com/highcharts http://api.highcharts.com/highcharts For our dashboards and most reports we now use a combination of custom Highcharts charts and standard widgets available at Geckoboard.