Red Bird Island - http://homepage.mac.com/redbird/ Free software for the Mac of various genres.
Mac OS X Man Pages - http://developer.apple.com/documentation/Darwin/Reference/ManPages/index.html Apple's collection of man pages available from the command line, but much easier to browse.
Apple - Downloads - UNIX & Open Source - http://www.apple.com/downloads/macosx/unix_open_source/ The UNIX and Open Source category of Mac OS X Downloads.
ONLamp - http://www.onlamp.com/ 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.
FinkCommander - http://finkcommander.sourceforge.net A graphical user interface for Fink. (only for Jaguar, as of version 0.5.0)
LAMP - http://lamp.sourceforge.net/ An ambitious project to provide a POSIX environment on Mac OS.
The Fink Project - http://fink.sourceforge.net/ Unix software ported to Mac OS X, either as binaries, or from source.
HandBrake - http://handbrake.m0k.org/ 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.
MacDevCenter - http://www.macdevcenter.com/ Mac development tutorials, opinion, and discussion from the O'Reilly Network.
Calxalot Software - http://calxalot.homeip.net/ Open source freeware for Mac OS X.
The Mac GNU OS X Public Archive - http://www.osxgnu.org Packages of all forms of Open Source Software including many Unix applications ported to or built for OS X.
MacPorts - http://www.macports.org/ Aims to provide an easy way to install various open-source software products on MacOS X.
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