The Computers: Software: Operating Systems: Unix: BSD: (FreeBSD BSD )

FreeBSD is a powerful Unix operating system derived from the BSD family. As well as countless home computers and small servers, FreeBSD powers huge sites like Yahoo!, Hotmail, and WCArchive, the busiest FTP server in the world. FreeBSD BSD Unix Operating Systems Software Computers.

FreeBSD is a free Unix-like operating system descended from Research Unix via the Berkeley Software Distribution (BSD). (wikipedia)