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Are Apis to generate graphs with statistics in a practical and fast way based on information you want to pass.
They are great for community systems and download portals, or other purposes, just like spreadsheet systems like Excel, only facing the WEB making it accessible to most browsers.
In addition to what software does it can be costumized and animated without needing to draw anything in drawing software.
Example: http://nvd3.org/examples/line.html
Example: https://bl.ocks.org/ravi4j/0e9a69a81bb8ccf989e6715df9931890
Graphics, creating graphics in javascript, usually using SVG or Canvas, on the site above is the related content: http://nvd3.org/
– Alex
Guy in this plugin just you click on what you want him to throw you to a screen where has the reference of everything he lists. Just go to the official website and read... https://www.wappalyzer.com/categories/javascript-graphics
– hugocsl