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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.
https://onionshare.org/ (not ready yet)
Have you tried SnapDrop/PairDrop? Those are super cool projects mainly for sending files between devices on the same network in P2P way, but you can also send text between them.
Here is another one cross platform file sync: https://syncthing.net/ For text sync applications there aren't many options that work cross platform Android/iOS/MacOS/Windows.
Personally I'm using those to transfer files between Windows 10 and Android phone, work as expected. There's also ShareDrop, but it's limited to sending files so no text sharing there unfortunately.