Optional/External

2bwm
9wm
aewm
AfterStep
AmiWM
awesome
Berry
Blackbox
bspwm
BunsenLabs Desktop
chadwm
CLFSWM
ctwm
cwm
dk
dusk
dwm
EMWM
evilwm
EXWM
Fluxbox
FLWM
FrankenWM
FVWM-Crystal
FVWM3
herbstluftwm
Hildon Desktop
i3
IceWM
instantWM
jbwm
JWM
Karmen
LeftWM
lwm
Mabox Desktop
MATE
MaXX Interactive Desktop
MLVWM
Moksha
Motif Window Manager (mwm)
MX Linux Fluxbox Desktop
Nimdow
Notion
NsCDE
Openbox
Orbitiny Desktop
pekwm
Peppermint Desktop
progman
Qvwm
Ragnar
ratpoison
Sapphire
Sawfish
shod
sowm
spectrwm
StumpWM
sxwm
TinyWM
Trinity Desktop Environment (TDE)
Tritium
TWin (Trinity Window Manager)
twm
Unicorn Desktop
UWM
vtwm
Window Maker
Wingo
wm2
WMFS2
wmii
wmx
worm
Xfce
xmonad
YeahWM
ZWM