DragonFlyBSD

Dragonfly BSD is a version of Unix forked from FreeBSD. The primary design change is in-kernel native support for clustering. This also has profound effects on the way multiple processors in a single machine are managed.

As of late 2009, the system is primarily of interest to developers who care about the issues it attempts to address. As the system matures and as processors get more cores, it may become much more broadly important.