The GTK+ Team

GTK+ for Linux
FreeCreate a graphical user interface which boasts cross platform compatibility and an easy to use API.
Linux
GTK+ Beta for Linux
FreeCreate a graphical user interface which boasts cross platform compatibility and an easy to use API.
LinuxGTK+ 2 Runtime Environment (64-bit)
FreeGTK+: Cross-Platform GUI Toolkit for Diverse Applications
Windows