I quote:

Most Mac OS X users prefer to use GUI tools to make Installations of software. By providing GNU software ported or built for the Apple Installer we are providing a needed service for the OS X community. Our Goal is to produce Tools for the OS X Package Installer/Maker and to port all Free/Open source software to the OS X Installer system as is possible. - THE GNU MAC OS X Public Archive

Maybe it's old gnus but it was gnu to me and came in especially handy when I needed to install useradd (why isn't that part of OS X?).