GIMP
GIMP is best known as the free GNU Image Manipulation Program for editing graphics, though the acronym also appears in projects related to prime number research and other miscellaneous uses.
Miscellaneous
Gamma Irradiated Man of Plastic
Gnu Image Modification Program
Graphic Image Manipulation Program
Gifted Intelligent Multitalented Person
Gnu Image Manupulation Program
Guy In Manly Pants