If you really want to customize things, you can download Mac Ports http://www.macports.org/ and install many of the same open source applications Linux users enjoy (because both mac and linux are Unix based).
You must have X11 installed
macdudeosx | Apr 30, 2010
Mac OS X Open Source
a short statement from the ccc 24c3 in berlin
Open source screen casting and audio capture on Mac OSX
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