The Gimp

      The GIMP is a multiplatform photo manipulation tool. GIMP is an acronym for GNU Image Manipulation Program. Is suitable for a variety of image manipulation tasks, including photo retouching, image composition, and image construction. 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 plug-ins and extensions to do just about anything. The advanced scripting interface allows everything from the simplest task to the most complex image manipulation procedures to be easily scripted.

       
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Excellent tool to modify,create images and icons.Now you can free download The Gimp. Have tools like rectangle select tool,elipse,hand-drawn,foreground,paths,color picker,zoom,measure and alignment,crop and rotate,scale and flip image,perspective view,bucket fill,blend,pencil and paintbrush, blur or sharpen,airbrush and ink tool,healing and burn.In this way can modify images and add new effects.Can set width,height and size.Has themes for web pages and preseted logos or other patterns.