Core utils in Rust: https://github.com/uutils/coreutils

Awesome, thank you.

CoreBoot port to Rust, started by Ron Minnich.

https://github.com/oreboot/oreboot

Userspace in Go for Core Boot/OreBoot, also started by Ron Minnich.

http://u-root.tk/

Similar effort for the PI,

https://gokrazy.org/

F-Secure Go's bare metal implementation, https://github.com/f-secure-foundry/tamago

For OCaml, there is https://ocaml.github.io/ocamlunix/.

And then all the utilities that come out from MirageOS and Xen projects.

Extremely useful, thanks!