Gtk-- (gtkmm) is a C++ interface for the popular GUI library gtk+.  Gtk--
provides a convenient interface for C++ programmers to create graphical user
interfaces with Gtk's flexible OO framework.  Highlights include type-safe
callbacks, widgets extensible using inheritance and over 180 classes that
can be freely combined to quickly create complex user interfaces.  Gtk-- is
free software distributed under the GNU Library General Public License
(LGPL).