Fvwm is a just another window manager for X11, which provides a simple virtual
desktop, a 3-D look for windows decorations, and shaped, color icons. 
It can be configured to use far less memory than twm, or to give a very 
good emulation of mwm. A nice button-bar can be used to provide convenient 
access to frequently used functions or programs.

Fvwm has three pieces
fvwm-1.23-core.tar.gz - the actual window manager
fvwm-1.23-icons.tar.gz - some icons that go nicely with fvwm
fvwm-1.23-modules.tar.gz - add on desktop accessories