GNU Image Manipulation Program​ ( LINUX )

gimp - GNU Image Manipulation Program​

The GIMP is an image manipulation program suitable for photo retouching, image composition and image authoring. Many people find it extremely useful in creating logos and other graphics for web pages. The GIMP has many of the tools and filters you would expect to find in similar commercial offerings, and some interesting extras as well.

The GIMP provides a large image manipulation toolbox, including channel operations and layers, effects, sub-pixel imaging and anti-aliasing, and conversions, all with multi-level undo.

http://www.gimp.org