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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.
I`m a GIS web developer. I mostly use https://nebula.gl/ for rendering, and https://turfjs.org/ for client side geo analysis. Another option is to use https://www.mapbox.com/mapbox-gljs, but it is proprietary.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.