GTK+ is a highly usable, feature rich toolkit for creating graphical user interfaces which boasts cross platform
compatibility and an easy to use API.

GTK+ was initially developed for and used by the GIMP, the GNU Image Manipulation Program. It is called the "The GIMP
ToolKit" so that the origins of the project are remembered. Today it is more commonly known as GTK+ for short and is
used by a large number of applications including the GNU project's GNOME desktop.