GTK+, or the GNU Image Manipulation Program (GIMP) Toolkit (a popular cross-platform image editor), is a cross-platform API for creating graphical applications. The project aims to provide a complete set of GUI widgets, supporting small graphical utilities up to large application suites:
Since its creation, the toolkit's adoption has rapidly expanded, supported by its open source license, which supports its use in commercial and freely available applications alike. While version 1.0 (released in 1998) was primarily to support the functions of the GIMP application, by 1.2 (released less than a year later) the toolkit was aiming at a broader audience. In 2002, version 2.0 was released, which saw GTK+ become the official tookit for the Gnome Linux desktop. This fully featured release...