Anything for Linux? Or cross-platform?
I looked for Qt bindings but they appeared to be abandoned last time I checked.
GTK4 bindings https://github.com/chris-armstrong/ocgtk
I see that unison (file sync tool) seems to use: https://garrigue.github.io/lablgtk/
For Linux UI.
GTK4 bindings https://github.com/chris-armstrong/ocgtk