There's also a work-in-progress (but working - it processes all WinMDs) generator for Rust, being developed by Patrick Reisert: https://www.github.com/contextfree/winrt-rust

(I started this GitHub repository but this has been developed 100% by Patrick so far, since everything I was working on was done much better by him. His fork is at https://github.com/Boddlnagg/winrt-rust )