gtk+3: gtk+3 - The Gimp Toolkit, Version 3 gtk+3: gtk+3: GTK+3 is a multi-platform toolkit for creating graphical user interfaces gtk+3: Offering a complete set of widgets, GTK+ is suitable for projects ranging gtk+3: from small one-off projects to complete application suites. gtk+3: gtk+3: gtk+3: gtk+3: gtk+3: gtk+3: