C++ wrappers for GTK+ (documentation)

 Gtkmm is a C++ interface for the popular GUI library GTK+, with API version
 2.4. Gtkmm 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.
 .
 This package contains FAQ, and reference documentation.