Airyx aims to bring some macOS to BSD

Airyx is a new open-source desktop operating system that aims to provide a similar experience and compatibility with macOS on x86-64 systems. It builds on the solid foundations of FreeBSD, existing open source packages in the same space, and new code to fill the gaps. Airyx aims to feel sleek, stable, familiar and intuitive, handle your daily tasks, and provide as much compatibility as possible with the commercial OS that inspired it.

An ambitious but interesting effort, that seems to align quite well with helloSystem.