Discover From This Page & Topic: [Discover] windowmanager
[Discover] GNOME: The Free Software Desktop Project http://www.gnome.org/
(desktop linux opensource gnome) 
[Discover] Enlightenment - Beauty at your fingertips http://www.enlightenment.org/ (wm enlightenment linux desktop)
[Discover] Window Maker - Your Next Window Manager http://www.windowmaker.info/ (linux desktop opensource software)
[Discover] fluxbox.org http://www.fluxbox.org/ (linux windowmanager wm fluxbox)