Druid is a new Rust-native UI toolkit, still in early stages. Its main goal is performance, also aiming for small binary size and compile time, fast startup, and very easy build configuration (just cargo run). It currently supports Windows and macOS, with GNU/Linux support planned. Raph gave a talk at the July 2018 SF Rust Meetup (video, slides) about the design. Traditional object-oriented designs have proved to be cumbersome.