The BSD family of operating systems date all the way back to the 1980s when AT&T owned the legal rights to the OS known generically as “Unix”. During that time, the source code was licensed out to a few communities, each of which developed their own proprietary version. One of the versions was BSD-Unix, named after the University of Berkeley. Due to license agreements with AT&T when Berkley tried to release their BSD-Unix for free, AT&T sued. The outcome of that lawsuit was the creation of BSD/OS, which was basically AT&T/BSD Unix with the proprietary AT&T code removed. Later on the commercial BSD was branched into what is today FreeBSD. FreeBSD currently runs on the Intel and Alpha architectures, with ports to Arm, Itanium, PowerPC and Sparc on the works.