DragonFly BSD 2.0.1
Belonging in the same operating system class, DragonFly BSD is based on the same Unix ideals and APIs as BSD and Linux. DragonFly forked from FreeBSD in 2003 and focused on re-writing most of the major kernel subsystems until 2007. Since then, DragonFly BSD has created and released HAMMER, a new file system that solved numerous existing issues and provided new capabilities to DragonFly BSD. HAMMER was included with the July, 2008 release of DragonFly BSD 2.0. DragonFly BSD is now focused on its ultimate goal, providing native cluster support in the kernel.
The 2.0.1 release of DragonFly was released yesterday, incorporating recent improvements to Hammer, including the new cleanup utility.