Mac OS Open Source
You have found the way to Open Source on Mac OS:
See also:
Apple - Downloads - UNIX & Open Source - The UNIX and Open Source category of Mac OS X Downloads.
Calxalot Software - Open source freeware for Mac OS X.
The Fink Project - Unix software ported to Mac OS X, either as binaries, or from source.
FinkCommander - A graphical user interface for Fink. (only for Jaguar, as of version 0.5.0)
HandBrake - A GPL'd multi-platform, multithreaded DVD to MPEG-4 ripper/converter. HandBrake was originally available on the BeOS, but now has been ported over to MacOS X and to GNU/Linux.
LAMP - An ambitious project to provide a POSIX environment on Mac OS.
The Mac GNU OS X Public Archive - Packages of all forms of Open Source Software including many Unix applications ported to or built for OS X.
Mac OS X Man Pages - Apple's collection of man pages available from the command line, but much easier to browse.
MacDevCenter - Mac development tutorials, opinion, and discussion from the O'Reilly Network.
MacPorts - Aims to provide an easy way to install various open-source software products on MacOS X.
ONLamp - O'Reilly's articles on LAMP: The Open Source Web Platform. Roughly defined as (but not limited to) MySQL used in conjunction with Linux, Apache, and either Perl, Python, or PHP.
Red Bird Island - Free software for the Mac of various genres. Help build the largest human-edited directory on the web.