The FreeBSD operating system is derived from the 4.4BSD-Lite2 distribution of Berkeley Unix, free of AT&T copyrighted code. It is a complete, self-contained system that runs on several architectures but is mostly targeted towards the Intel i386 (and clone) and amd64 architectures. FreeBSD is popular as a server system, hosting high volume web sites, email systems and the like. It is also a comfortable timesharing system. More information on it can be found at: http://www.freebsd.org/2 responses total.
This has tangentially to do with FreeBSD: http://xkcd.com/518/
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