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Re:Ask HN: Your favorite open-source JavaScript Library for ... by superflit on Wednesday May 18, 2016 @09:02AM (#11721565)
The one I use is HighCharts [1]

Very clean and very good.

[1] - http://www.highcharts.com/

Re:Ask HN: Your favorite open-source JavaScript Library for ... by stadeschuldt on Thursday May 19, 2016 @07:07AM (#11729297)
I love HighCharts and use it for my open-source project at http://solarpi.tafkas.net

If you have a commercial product you have to pay for the license though.