] DragonFly is an operating system and environment designed
] to be the logical continuation of the FreeBSD-4.x OS
] series. These operating systems belong in the same class
] as Linux in that they are based on UNIX ideals and APIs.
] DragonFly is a fork in the path, so to speak, giving the
] BSD base an opportunity to grow in an entirely new
] direction from the one taken in the FreeBSD-5 series.

Another BSD fork...

The DragonFly BSD Project