one of the libraries underpinning the Linux graphics ecosystem is called the GNU is Not Unix Image Manipulation Program Tool Kit. It is primarily used by GNU is Not Unix Network Object Model Environment. GTK's primary competitor (qt) was created by a company called Trolltech, and qt is the primary library of the Kool Desktop Environment.

All of these bind to the X window system, which is named that way because it's the successor to the W window system, which was the window system of the V operating system. It is currently being succeeded by a window system named after a town in Massachusetts.