OpenBSD 4.5, Secure Open Source BSD operating system has been released to public. The OpenBSD project produces a FREE, multi-platform 4.4BSD-based UNIX-like operating system. OpenBSD is developed entirely by volunteers.
OpenBSD project claims that, only two remote holes in the default install of its operating system in more than 10 years. For a comprehensive list of new features in OpenBSD 4.5, see the changelog.
OpenBSD supports binary emulation of most programs from SVR4 (Solaris), FreeBSD, Linux, BSD/OS, SunOS and HP-UX. OpenBSD is freely available, which you can download from the FTP page or order a CD-ROM.