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GTK is a popular toolkit for creating programs with a graphical user interface that works with the X Window System or, more recently, Wayland. Such toolkits provide programmers with easy ways to create windows, menus, pop-up dialogs, and other common ways to interact with graphical programs. Licensed under the LGPL license (GNU Lesser General Public License), GTK is free (and open-source) software, and is part of the GNU Project. This means you are granted certain freedoms such as being able to inspect the code, change it, and distribute your modifications.

GTK was previously known as GTK+, but was renamed to just GTK in February 2019. Originally GTK was an acronym for the Gimp ToolKit, which was created for the graphics editing program GIMP.

Desktop environments and window managers that use GTK

Other toolkits