ozkl/ruxis is a Unix-like kernel written in Rust. According to the README, 0.1.0 implements the Linux 6.6 system call interface and aims to be compatible with the Linux user space. It boots via UEFI on x86_64 and arm64. UEFI is the firmware interface that starts an operating system. The repository description is 'A Kernel in Rust', and the Show HN project carries a blurb noting that it is a kernel written by Opus 5.5.
The README enumerates support for Ubuntu 24.04 with systemd, desktop environments, networking and storage drivers, namespaces, and cgroup v2. Namespaces isolate the resources visible to each process, and cgroup v2 manages resource usage for groups of processes. It also provides commands to run it in QEMU and to run its own tests. The license is MIT. This scope matters because the target is not merely a kernel that boots, but user-space programs for Linux and desktop environments as well.
That said, this is the support scope stated by the README. FACTS contains no separate verification results or performance measurements, and there is no public release. For now, it is better regarded as an early kernel implementation claiming broad compatibility, and its real drop-in potential has not been confirmed.