Sawfish (the window manager formerly known as Sawmill) is an extensible window manager using a Lisp-based extension language. All window decorations are configurable and all user-interface policy is controlled through the language. Its aim is to manage windows in the most flexible and attractive manner possible. As such it does not implement desktop backgrounds, application docks, or other things that may be achieved through separate applications. Sawfish is mostly GNOME-compliant; almost all configuration may be made through a graphical interface.
Genmenu can generate menus for Blackbox, Fluxbox, Openbox, Window Maker, and Enlightenment based on the program binaries found installed on a system. The list of programs to search for are contained within the script. Users can, to a limited degree, customize their menus via a set of interactive questions.
CTWM is a highly-configurable window manager based on the classic TWM window manager. It supports xpms, multiple workspaces, advanced icon managment, animated icons and backgrounds, 3D titles and borders, etc. It offers rudimentary Gnome support and is backwards-compatible with TWM.
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.