The Gtk2 module allows a Perl developer to use the GTK+ graphical user interface library. Find out more about GTK+ at https://gtk.org/

The GTK+ Reference Manual is also a handy companion when writing Gtk applications in any language.
The Perl bindings follow the C API very closely, and the C reference documentation should be considered the canonical source.

To discuss gtk2-perl, ask questions and flame/praise the authors, join gtk-perl-list@gnome.org at lists.gnome.org.

Also have a look at the gtk2-perl website and sourceforge project page, http://gtk2-perl.sourceforge.net/