MOOS
C# x64 operating system programming with the .NET native
...Written in Rust, MOOS provides a safe and modern platform to explore low-level system design, with a minimal but functional kernel that supports multitasking, a virtual memory manager, and a tiny standard library. It targets x86_64 and runs on QEMU, making it suitable for students and developers learning about OS fundamentals or testing novel ideas in kernel development.