GNU Image Manipulation Program (GIMP) is the longtime open-source photo editing alternative to Adobe’s category-leading Photoshop. It includes many powerful Photoshop-like capabilities, such as layers ...

OS X: GIMP is a fantastic free alternative to Photoshop for all desktop operating systems, but on Mac it was a bit of a pain to set it up, because you needed to install X11. Gimp now, however, comes ...