Gimp Image Manipulation & Design Program

I used it on a Linux build i once had on a spare PC. it was pretty fully featured and i reckon once you had used it for a while you could do some great stuff with it.
Yes, I’ve used it as well and it’s pretty good, the Free downside to windows programs is actually a good thing when you have a Linux platform, it just means wider support for any product you use.
I know quite a lot of people who use it and have seen some outstanding results.... but I suppose at the end of the day, it's the user rather than the tool that makes it.