This is the GIMP, but compiled more closely to look like Photoshop:
Download: For Windows
This takes the multi-windowed, strangely named icon package of the gimp, and then puts it in a single window, with names closely resembling that of Photoshop.
I think many of you will find this very interesting and useful. I know it changed the way I look at the Gimp, now it is no longer second rate, but rather, a competitor to Photoshop.
Screenshot: View Gimp Shot