What technology (product) is used for this graph?

Question

JavaScript

Hello!
Need help finding a solution to create such a graph (an example source is here , and a screenshot is at the end of the question). For my purposes, this is the most suitable shell and functionality, so I would like to ask an expert:

1. What technology(s) is this chart based on?
   
2. If this is a product solution, would you like to know the name?
   
3. Is there an open source product that allows you to create a similar graph?
   

Earlier I thought about choosing Chart.js , Google Developers Chart . And another solution ( Highcharts ) is not suitable due to the cost of a license for commercial activities (and I need charts for business). So far, only JavaScript + SVG remained in my head, but I would like to choose a ready-made product solution, because. I can hardly write all this on my own.
And I would like to add one more mini-question to the last paragraph : what is the price range for programmer services (JS or others) to create (build, configure) the desired graph (+ a couple of small additional functions) from an open source product? Thanks
in advance to everyone who answers the question!

Answer 1

D3js
(taken out in response from the comments) It is this graph that is built on D3 - see the source code of the widget frame of this graph.
D3 is a library, starting from the 4th version - a set of separate modules. There are no “ready-made” charts in D3 itself, but there is everything for building any chart: beautiful, with interactive and animations, loading data from external sources, etc. You can, of course, take someone's examples of graphs on D3 and modify them to fit your needs.
The cost of developing a custom chart, as in the example, I would very roughly estimate in the range from $100 to $1000.

Answer 2

I think what you need