Highcharts.js has a free-for-noncommercial, paid-otherwise license system https://shop.highsoft.com/highcharts https://shop.highsoft.com/highcharts (Not affil

Highcharts.js has a free-for-noncommercial, paid-otherwise license system https://shop.highsoft.com/highcharts https://shop.highsoft.com/highcharts (Not affiliated, but using highcharts for a project @ a non-profit)