Thinking about it I don't think I use any freeware for my photography/life. I use Adium for IM and Smultron for coding but all my other software I get through macheist or though being a student and being able to get things dirt cheap!
I do use thumbscrew occassionally though:
http://thumbscrewformac.com/
I use bridge/photoshow raw/photoshop for editing photos.