There are a lot more options but nothing that's clearly winning. The first projects I'd check for building a GUI today are Microsoft exposing the Windows UI too

There are a lot more options but nothing that's clearly winning. The first projects I'd check for building a GUI today are Microsoft exposing the Windows UI toolkit and the Rust+Flutter integration. I know that the GTK crowd were engaged with the Rust core team years ago but I don't know if anything came from that. I'm still on the DOM-as-the-main-platform train (since 2001, I believe in the Mozilla vision) so I haven't been tracking the details that carefully.