| 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. |