AFAIK, for better or worse, this is the only UI crate (other than HTML-like UI using something like Tauri) that provides a full set of widgets/capabilities on Rust. Every other UI lib is incomplete in some way or falls short for anything other than a toy or specialty type app in my experience.
UPDATE: Things I have my eye on as they mature: Slint, egui, and iced. I'm especially watching iced as Pop_os is using it for their DE and likely will add quite a few widgets.
I have not looked, but are there no Qt bindings for rust? Qt is about as complete as they get.