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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.
Very honest question: where would you rather start and focus on? Feel free to join the matrix channel (https://matrix.to/#/#capyloon:matrix.org) if you want to chat about it!
There is a map app for KaiOS that essentially just wraps openstreetmap https://github.com/strukturart/o.map
If you look at the official microG wiki [1], most of the functionality is only partially implemented and/or has bugs. I don't see how it's shallow to consider that as janky.
[1] https://github.com/microg/GmsCore/wiki/Implementation-Status
It's open source, and all new code is released under AGPL. See the frontend repo at https://github.com/capyloon/nutria/ for instance.