I'm working on Slint. It is a declarative UI language that compiles to native code, the application logic can be written in Rust, C++, TS or Python, and it is cross platform, including mobile. Has accessibility through AccessKit. A live preview, so iterating on the UI doesn't mean recompiling Rust.

Compared to Electron, there is no browser, so binaries are a much smaller, use less memory, startup is fast. And the attack surface is also much smaller (no XSS)