OpenBSD definition 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/).