No

1wm
aewm++
Agnostep Desktop
antiX IceWM Desktop
CellWM
Common Desktop Environment (CDE)
doWM
echinus
Gershwin Desktop
GNUstep Desktop Environment (GSDE)
GNUstep GWorkspace
goomwwm
jotawm
katriawm
Lumina Desktop
LXDE
marswm
matwm2
Minimal Window Manager (Krzysztof Marciniak)
miwm
MRIYA
musca
MWM+ (Minimal Window Manager Plus)
NEXTSPACE
noxzbox
NVWM
NWM (tinyopsec)
NWM Omega
nyxwm
OXWM
Page
plwm
Puppy JWM/ROX Desktop
rio (plan9port)
RubyWM
sdorfehs
SithWM
Sugar
Tiny Core FLWM Desktop
TreeWM
VXWM
w9wm
WindowLab
WMFS
X11::korgwm
Xiri WM
xwm (mcpcpc)