GTK+ is a multi-platform toolkit for creating graphical user interfaces. Offering a complete set of widgets, GTK+ is suitable for projects ranging from small one-off tools to complete application suites. GTK+ has been designed from the ground up to support a range of languages, not only C/C++. Using GTK+ from languages such as Perl and Python (especially in combination with the Glade GUI builder) provides an effective method of rapid application development. GTK+ is free software and part of the GNU Project. However, the licensing terms for GTK+, the GNU LGPL, allow it to be used by all developers, including those developing proprietary software, without any license fees or royalties. GTK+ is the only 100% free-of-cost open source industrial-strength GUI toolkit available today. Since its origins as the toolkit for the GNU Image Manipulation Program (GIMP), GTK+ has been used in a wide range of software. Notably, GTK+ is the foundation of the GNOME desktop; GTK+-2.4 will be incorporated into the soon-to-be-released version 2.6 of the GNOME desktop.