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What language and framework do you use for GUI programming?

Camlkit-gui for macOS

Anything for Linux? Or cross-platform?

I looked for Qt bindings but they appeared to be abandoned last time I checked.

I see that unison (file sync tool) seems to use: https://garrigue.github.io/lablgtk/

For Linux UI.

But that uses Gtk 3. Gtk 4 is already more than 5 years old ...

5 years is no age for an UI kit! ;-)