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Re:Polychart.js: An Interactive Charting Library by Demiurge on Tuesday April 09, 2013 @03:55PM (#5520823)
In a world of so many wonderful free open source graphing libraries, it's hard to see any reasonable licensing option for this. It might help if there was a page that listed features that a developer could not accomplish for $300 in flot, highcharts, or ndv3, or other popular options.
Re:Polychart.js: An Interactive Charting Library by pessimizer on Tuesday April 09, 2013 @04:34PM (#5521139)
Highcharts isn't free either, at least for commercial use.
Re:Polychart.js: An Interactive Charting Library by chaostheory on Wednesday April 10, 2013 @01:26AM (#5523367)
It's cheaper.
Re:Polychart.js: An Interactive Charting Library by Ecio78 on Wednesday April 10, 2013 @05:10AM (#5524030)
Highcharts is cheaper if you use it for a single webpage (90$) but if you want to use if for a real web app it's more expensive (590$ for a single developer). Having said that, in my enterprise my dev colleagues use it and they think it's a great product.

EDIT: if you host it for a personal/non-profit project it is free according to Creative Commons Attribution-NonCommercial License

another product we've used in the past is Amcharts, good buy maybe not good as Highcharts

Re:Polychart.js: An Interactive Charting Library by Demiurge on Wednesday April 10, 2013 @03:11PM (#5527343)
And I still prefer the free flot or flotr2, because they are easier to modify.