Also if you wanna GUI puredarwin exist , based on X11 no macOS GUI subsystem:

- https://sourceforge.net/projects/puredarwin/files/2012/ older

- https://github.com/PureDarwin/PureDarwin/releases/tag/17.4 older just before new Nix

- https://www.puredarwin.org/#get-it newest using X11 and Nix packager

this is when still using FreeBSD/NextBSD kernel, that DE using ObjC and basic framebuffer no x11 / wayland. The current one using Darwin kernel but still CLI only and no graphics subsystem supported yet.