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. http://www.osxgnu.org

Red Bird Island Free software for the Mac of various genres. http://homepage.mac.com/redbird/

MacDevCenter Mac development tutorials, opinion, and discussion from the O'Reilly Network. http://www.macdevcenter.com/

Mac OS X Man Pages Apple's collection of man pages available from the command line, but much easier to browse. http://developer.apple.com/documentation/Darwin/Reference/ManPages/index.html

The Fink Project Unix software ported to Mac OS X, either as binaries, or from source. http://fink.sourceforge.net/

LAMP An ambitious project to provide a POSIX environment on Mac OS. http://lamp.sourceforge.net/

Mac OS Open Source Software Directory A resource to the Mac user and developer communities providing links to and information about open source software projects developed for the MacOS. http://www.macdevcenter.com/pub/q/mac_os_directory

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. http://www.onlamp.com/

FinkCommander A graphical user interface for Fink. (only for Jaguar, as of version 0.5.0) http://finkcommander.sourceforge.net

O'Reilly Network: Mac Open Source Software Directory All submissions go through an editorial review before being posted to the site. http://www.oreillynet.com/pub/q/mac_os_directory

Pixilate A site dedicated to the design of typography, icons, and animation. http://www.pixilate.com/