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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.
If you have coding experience and already have a may you created in another tool leaflet.js https://leafletjs.com/ allows you to use any image you want to zoom scroll etc. I have used the very large Forgotten Realms map you can find on the net. You can add code to create pins, etc. Have markers that can pull info from a db etc.
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.