GIMPshop is a modification of GIMP, intended to replicate the feel of Adobe Photoshop. Its primary purpose is to make users of Photoshop feel comfortable using GIMP...Many Photoshop tutorials can be followed in GIMPshop...
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. This is the official GIMP web sit