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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 full-time traveling around Australia in a van doing vanlife (https://ghuntley.com). Admittedly I do have Starlink on my van which makes things easier. Haven't really ever found myself being able to be productive without internet these days because of how software has changed in the terms of open-source software graphs for many, including myself, having internet is a hard requirement for even building software let alone looking up SDK man pages.