GIMP is a freely distributed program for such tasks as photo retouching, image composition, and image authoring. A portable version is also available.
GIMP is an acronym for GNU Image Manipulation Program. It is a freely distributed program for such tasks as photo retouching, image composition, and image authoring. It has many capabilities. It can be used as a simple paint program, an expert-quality photo retouching program, an online batch processing system, a mass production image renderer, an image format converter, etc. GIMP is expandable and extensible. It is designed to be augmented with plugins and extensions to do just about anything. The advanced scripting interface allows everything from the most simple task to the most complex image-manipulation procedures to be easily scripted.
Gimp has an extensive registry of plugins to help you customize, edit, and automate your image tasks.