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GIMP (GNU Image Manipulation Program) is a free and open source software image retouching and editing tool and is freely available in versions tailored for most  popular operating systems including Microsoft Windows, Apple Mac OS X, and Linux.

GIMP has tools used for image retouching and editing, free-form drawing, resizing, cropping, photo-montages (combining multiple images), converting between different image formats, and more specialised tasks. Animated images such as GIF and MPEG files can be created using an animation plugin.