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GIMP (GNU Image Manipulation Program) is software program for authoring and working on images. It can aid in creating textures, skins, and liveries for aircraft and scenery for FlightGear. The latest version is GIMP 2.6, which came out October 2008.
See Howto: Add smooth ("Ambient Occlusion") shadows in Blender#Merging the AO texture as layer into the master texture.2C and post-processing for an example of using The Gimp for FlightGear related development.