The GIMP

The GIMP is the GNU Image Manipulation Program. It is a freely distributed piece of software for such tasks as photo retouching, image composition and image authoring. It works on many operating systems, in many languages. It was initially supported in Mac OS X using X11:

...but only got a usable, "native" port in August 2012. That crashes a lot (especially if you run it as a non-admin user) and still has the same UI.

• download page
• First mention of GIMP joining the Open Usability project. Notice how many people in the discussion find the current interface unusable, and the commentary on the project itself.
• Seashore, a Cocoa app based on the GIMP
• GimpShop, a rebuild that tries to make the GIMP useful by making it look a lot more like Photoshop and eliminating a lot of the GUI mess - still requires X11 on the Mac, though.
  • Linux versions
  • Windows version - pretty good, and one I actually caught myself recommending to a colleague.
• Pre-Built Application Bundle
• Windows GIMP Deweirdifyer - my link of choice for all those people who keep asking why I find the GIMP's original interface horrid.