 Besides these distributions , there are some independent operating systems based on FreeBSD . DragonFly BSD is a fork from FreeBSD 4 @.@ 8 aiming for a different multiprocessor synchronization strategy than the one chosen for FreeBSD 5 and development of some microkernel features . It does not aim to stay compatible with FreeBSD and has huge differences in the kernel and basic userland . MidnightBSD is a fork of FreeBSD 6 @.@ 1 borrowing heavily from NeXTSTEP , particularly in the user interface department . 
