GIMP is a very versatile graphics editing software. It works on bitmap images, provides layered editing, a plethora of drawing and colorization tools, photo enhancing and retouching features and filters, programmatic effects, various extension and scripting capabilities, and itself provides a highly adaptable multi-window interface. It can open nearly any graphics format, or import Photoshop, PDF, Postscript, SVG and other vector formats even.
G'MIC (GREYC's Magic for Image Computing) is a portable and scriptable image processing framework. It comes as C++ library, can be used as command line tool, as Gimp plugin, as web service, or with its Qt application. G'MIC allows image conversion, manipulation, applying complex filters and visualization pipelines. Various image types can be used, 1D/2D/3D sources, multi-spectral and volumetric images or 3D vector objects, regardless of pixel depths. The "gmic" command line tool is often an alte