FOX GUI Toolkit: An open source cross-platform C++ based Toolkit for GUI development.GUIS: Open source widget server. (Python, Ruby, GTK2) [OS Independent]InputGUIDO: A GUI being developed for older DOS systems that are incapable of running Windows.Java Gui Builder: An engine that reads XML files describing graphical user interfaces layout.KronoJunior: Open source GUI for less powerful or old computers.ObjectCentral - V: A free, multiple platform C++ graphical user interface framework.Prima: Toolkit for multi-platform GUI development. (Perl) [OS Independent]The Official FVWM Homepage: The standard window manager for linux, stable but not as pretty as Window Maker or Enlightenment.The Visual Component Framework: C++ framework created to provide platform GUI framework, features such as Java and Java's Swing, and Borland's Visual Component Library.