Gimp
A popular image editor with unique freeware capabilities.
GIMP (GNU Image Manipulation Program) is freeware suitable for such tasks as photo retouching, image composition, and image authoring. Use GIMP as a simple paint program, an expert-quality photo-retouching program, an online batch-processing system, a mass production image renderer, or an image-format converter. Modular, expandable, and extensible, GIMP is designed to be augmented with plug-ins and extensions to do just about anything.
