Our great sponsors
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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.
For your frontend: MapLibre GL [1] is the fork of Mapbox GL that's still open source, so you don't have to pay for each usage.
For tile hosting: Openmaptiles [2], based on Openstreetmap data. Either pay them for out-of-the-box experience, or use their open-source code to set up your own server at whatever hosting for whatever price you prefer.
[1] https://github.com/MapLibre/maplibre-gl-js
[2] https://openmaptiles.org/
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.