I've posted lists of great open-source software for the Mac before, but stumbled across this one today, and think it's a nice, comprehensive yet concise list of the best open-source software for the Mac. I've used many of these and plan to download a few from the list that I hadn't heard of.
With rising numbers moving to the Mac and its impressive OS X, more and more people will discover that the
Mac is one of the best platforms for open source out there. See for yourself.