The Arch Linux distribution has been modified to run off the FreeBSD 9.0 kernel as an alternative to using Linux. The developer of ArchBSD explained his reasoning as enjoying FreeBSD while also liking the Arch Linux philosophy of a ‘fast, lightweight, optimized distro’.

After Debian GNU/kFreeBSD and Gentoo/FreeBSD we have a third Linux-FreeBSD hybrid.

Read the full article on Phoronix: Arch BSD: Arch Linux Atop The FreeBSD Kernel or follow some of the discussions here.