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I've used AnyChart and HighCharts JS and they both seem to be viable options. They look good and are very customizable.

I used HighCharts in my last position, I second that they are a very attractive and easy to work with charting library.

I preferred their older image charts which are now deprecated. [2] https://developers.google.com/chart/image/?hl=en

You can fill keen.io (I think it's cassandra database) and then run queries with chart output against that. https://keen.io/docs/data-visualization/

D3.js

Ask HN: Charting tools