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proj4js
JavaScript library to transform coordinates from one coordinate system to another, including datum transformations
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
In addition, I will make use of another JavaScript library — Proj4js — which, in short, takes care of plotting the coordinates over the respective geographical areas.
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Hence, a higher number means a more popular project.