A dynamic window manager for X11
A multiple large virtual desktop window manager originally derived from twm.
A Linux window manager.
Ratpoison is a simple Window Manager with no fat library dependencies, no fancy graphics, no window decorations.
A window manager for linux inspired by Tracktion.
GEX is just another desktop environment.
XIGE is a window manager for X Window System, developed on linux with GPL license.
Black Orion Network is an update and system management platform.