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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.
From there, you will need to take your exported GPS track files, and combine them, so they show up on a single map. I use https://erik.github.io/derive/, which loads the file within your own browser and doesn't send the tracks to anyone's servers.
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Hence, a higher number means a more popular project.