FreeBSD

Started in June 1993, FreeBSD aims to conform to the Single UNIX Specification. Its kernel, C library and basic utilities are maintained "under one roof" in synchrony, mainly under a business-friendly license. Originally intended only for the PC, it is now available for other computer architectures such as Alpha, AMD64, Itanium, and UltraSPARC. It runs nearly two million Web sites but is also well-suited for appliance-type devices or workstations.

Several programmers who work on various parts of the system will be on hand. CD-ROMs provided by the FreeBSD Mall will be given away. A computer with FreeBSD will be available for exploration.

Visit website for more information: http://www.freebsd.org