GIMP (http://www.gimp.org/) does run with MAC OS X. I had a friend in college who use to run it. I'm not sure how involved it will be to install though. It looks pretty simple from the install page though, but I'm pretty ignorant about MAC OS X. Windows just involves installing GTK and GIMP which are already prepackaged and just need to be downloaded and run to install. The other little programs I know about are windows only though I think... =/
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The other little programs I know about are windows only though I think... =/