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Also Relm which is Rust+Elm-inspired+Gtk

Also yew. It's more web focussed, but it works great running in a WebView for a local application with RPC to a background server running locally.

https://github.com/yewstack/yew

I like the ELM model for UI. The stateless/functional view approach is very similar to IMGUI [^1]. It makes things much less error prone with much less state management / hierarchy management to do than the React model.

[^1]: https://github.com/ocornut/imgui

Also Yew[1], which is a bit different, but a relatively flushed out component model.

[1] https://github.com/yewstack/yew