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GTK+, or The GIMP Toolkit, is a cross-platform widget toolkit for creating graphical user interfaces. It is one of the most popular toolkits for the X Window System, along with Qt.

GTK+ was initially created for the GNU Image Manipulation Program (GIMP), a raster graphics editor, in 1997 by Spencer Kimball and Peter Mattis, members of eXperimental Computing Facility (XCF) at UC Berkeley.

Licensed under the LGPL, GTK+ is free software and is part of the GNU Project.

Community content is available under CC-BY-SA unless otherwise noted.