(http://www.openbsd.org/43.html {http://www.openbsd.org/images/puffy43.gif OpenBSD logo})
The OpenBSD project produces a FREE, multi-platform 4.4BSD-based UNIX-like operating system. Their efforts emphasize portability, standardization, correctness, proactive security and integrated cryptography. OpenBSD supports binary emulation of most programs from SVR4 (Solaris), FreeBSD, Linux, BSD/OS, SunOS and HP-UX.
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!! Useful OpenBSD resources
* (http://www.openbsd.org/ The OpenBSD website)
* (http://www.onlamp.com/pub/a/bsd/2002/07/25/Big_Scary_Daemons.html Installing OpenBSD)
* (http://www.well.com/~jbyrd/firewall.html Creating a Combined Ethernet/Wireless Firewall)