Firestarter is a firewall tool for Linux, and uses GNOME. You can use the wizard to create a basic firewall, then streamline it further using the dynamic rules. You can open and close ports with a few clicks, or stealth your services giving access only to a select few. It features a real-time hit monitor which you can watch as attackers probe your machine for open ports.
Flwm is an X window manager designed to be user friendly and use the absolute minimum amount of screen real estate. It has no icons, using a pop-up menu to select hidden or new windows, and sideways titlebars. Flwm is also designed to achieve Gnome, KDE, and Motif compatibility simultaneously and has also been tested with many SGI programs that normally require 4DWM.
FM is a Gtk+ file manager which aims to offer the best possible ratio between features, simplicity, and resource usage. Currently all the efforts have gone to the development of the browser. Much thought has been put into the creation of an efficient and easy-to-use interface. Several existing file managers on a variety of platforms have been used as an inspiration and lots of new and original features have been added. File operations are not yet possible, but will soon be supported through a modular interface that will allow anyone to extend and customize Fm.