- Apple: SwiftUI/AppKit
- Android: Jetpack
- Windows + Linux: Avalonia (C#)
Avalonia seems good so far. I couldn't do Qt because I can't deal with that qBittorrent look. GTK is aesthetically pleasing for me, but it only runs on Linux. Avalonia lets me target both of these UI-toolkit-less platforms with something native-ish. Flutter is probably good too, but I am using uniffi-rs and that doesn't generate Dart bindings AFAIK.
Would love to hear other options.