DragonFly BSD, originally branched from FreeBSD in 2003, is working on a new approach to SMP and other kernel systems to enable an open source Single System Image operating system. Along the way, we've been picking up improvements from other BSDs and generally streamlining the underlying 30-year-old BSD code base, with a preference towards making systems less complex and easier to maintain.

Our code repository can be found here: http://code.google.com/p/google-summer-of-code-2011-dragonfly-bsd/