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GTK is an Acronym for the Gimp ToolKit. Initially created for the graphics program GIMP, the GIMP Toolkit - abbreviated as GTK+ - is one of the two most popular widget toolkits for the X Window System, intended for creating graphical user interfaces. It's officially known as GTK+, but the little '+' is often left out in calling its name.

Licensed under the LGPL license (GNU Lesser General Public License), GTK+ is free (and open-source) software, and is part of the GNU Project.

Desktop environments and Window manager that uses GTK