Programming languages that can be used in GNOME.

GNOME is intended to support many languages. But you need to have GTK+ and GNOME bindings for your particular language. Our preferred languages are C and scheme (using guile.) There are bindings too for Objective C. There also are GTK bindings for C++ (Gtk--) and for Perl, but as far as I know, they aren't very good and still there aren't bindings for GNOME stuff for these languages.