OpenBSD

from The Free On-line Dictionary of Computing (8 July 2008)

OpenBSD

   <operating system> A version of {BSD Unix} with an emphasis on
   security.  A lot of security work that is ported to other free
   operating systems originates with OpenBSD and a lot of {code
   review} is done here.

   Sub-projects of OpenBSD include implementations of SSH
   (http://openssh.org/), ntpd (http://openntpd.org/),
   and {CVS}, to be called OpenCVS.

   OpenBSD Home (http://openbsd.org/).

   (2005-01-17)