This category contains sites relating to software that allows the Macintosh to run as a Unix machine. There are many flavors of Unix. While Unix-like, Linux-related sites perform the same functions and should be posted to Computers/Systems/Macintosh/Software/Linux.
Mach is a POSIX conformant BSD UNIX, with a complete Internet protocol suite and a gnu-based software development environment that runs as a MacOS application. This allows Macintosh tools such as editors (BBEDIT or Alpha) , Configuration Management (Projector), and other tools to work with Machtens Unix tools such as gcc, RCS, AYAC etc.