Many fans of the opensource world have long used Gimp for doing their photo and image editing. It is a quite powerful and fully featured application. A talented and resourceful individual called Scott Moschella of Plastic Bugs has rerendered the gimp to more closely match Photoshops functionality. What's more is that in the tradition of all good opensource it's all free. It is called GimpShop, It is well worth a look and for those of you who dare to try it you'll be no doubt impressed by its performance. Mac and Linux ports are here. A Windows port is being worked on as we speak, but an unofficial version is available here..