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Could Blazor WebAssembly be an option? I recommend looking into it if you are at all familiar with C# and the .NET ecosystem.

I'm not very experienced with developing progressive web apps, but I enjoyed getting started with Angular. They have a neat tutorial and you get a plain PWA in a breeze (see Angular service worker introduction). You'll get a service worker, so you don't need to write one yourself. The development stack for Angular is based on npm, nodejs, TypeScript and ...

Threema would fit your requirements almost completely: Isn't owned by Facebook, inc.: Nope. It's owned by Swiss-based Threema and has a strong focus on privacy. So it's just the opposite to those "kraken" Is gratis to use: Using it is gratis, yes. There's just a very reasonable one-time fee for the license (less than 3 bucks). Per device that is (you can ...