Neooffice runs natively but I don't think Macgimp runs as a Cocoa application. There's Seashore but its too limited for OSX. I downloaded the German Photoline32 which is a graphics editor that does run in OSX and also in Windows. The bad news is its pricey. I opted to buy a copy of Adobe Photoshop Elements 2.0. Its a less expensive version of Photoshop and Richard Lynch has a good website (http://www.hiddenelements.com) with free tools that will let you do almost anything in PSE that you want to do in Photoshop. I don't intend to do professional photography and more isn't necessarily the best. Most us don't drive a Ferrari and we ought to do the same in finding software that does what we want it to do.
(Denny Crane: "I Don't Want To Socialize With A Pinko Liberal Democrat Commie. Say What You Like About Republicans. We Stick To Our Convictions. Even When We Know We're Dead Wrong.")