Gtk

GTK+ is cross platform and extensively used. It is used by the GNOME desktop, and the Xfce desktop.

• GTK+ Homepage
• GTK Wikipedia Article
• Glade (GUI Designer)

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Ada

• GTK Ada

Assembly

• For NASM

C

• GTK Home Page
• GTK+ 2.0 Tutorial

C++

• GTK+ 2.0 Tutorial
• C++ Interfaces for GTK+ and GNOME

C#

• GTK#

D

• DUI

Forth

Fortran

• pilib

Haskell

• GTK2hs

Java

• Java-GNOME

Lisp

• cl-gtk

Objective-C

• gtkkit

Octave

• octave-gtk

Perl

• GTK Perl

PHP

• PHP-GTK

Python

• PyGTK (Reference)
• GTK and Glade
• PyGTK (Tutorial)

Ruby

• Ruby-GNOME2

Tcl

• tcl-gtk