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There's also Kerla [1] (Monolithic kernel in Rust, aiming for Linux ABI compatibility), but that seems to have gone dormant for few years.

[1] https://news.ycombinator.com/item?id=28986229

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Or Redox OS, which is still there: https://www.redox-os.org/. It has a micro kernel design. But it is a bit more mature probably. And also MIT licensed so, there probably is some opportunity for code sharing.

Last time I had a look at it Redox didn't (even want to) implement Linux ABI compatibility.

Seems that the project is dead. The repository does not receive any commit for two years.

No its not. See: https://gitlab.redox-os.org/redox-os/redox/

https://www.redox-os.org/news/development-priorities-2023-09...

They were talking about Kerla but replied to the wrong comment.

The redox-os post mentions cosmic desktop, and future wayland support, which may now already be almost implemented?

The System76 blog appears to have updates regarding COSMIC DE: https://blog.system76.com/post/the-spirit-of-cosmic-december...

Components of Cosmic Desktop Rust-based Desktop Environment: https://github.com/pop-os/cosmic-epoch#components-of-cosmic-...

cosmic-comp/src/wayland/handlers https://github.com/pop-os/cosmic-comp/tree/master_jammy/src/...

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