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egui is a framework for building UI apps written in Rust. I have ported it to the Car Thing. Linked is a video demo. The code is here: https://github.com/null-dev/tt
I chose egui because it is performance, efficiency and reliability focused. It does not have a lot of focus on aesthetics though. If you really want to build awesome looking apps, lvgl (just check out those demos, they are gorgeous!) may be a better choice.
For compiling stuff I've assembled a partial buildroot you can find here: https://github.com/null-dev/car-thing-buildroot. The buildroot gives me a full cross-compilation toolchain so I can compile whatever I want as long as I have all the env variables setup to point at the buildroot.