GPL-2.0-or-later

awesome
Budgie
Cinnamon
CoW
FLWM
FVWM-Crystal
FVWM3
Glacier UX
GNOME
GNUstep GWorkspace
gTile
Hildon Desktop
jbwm
KDE Plasma
Kodi Standalone Session
KWin
lwm
LXDE
LXQt
Magpie
MATE
Metacity
miwm
MLVWM
Muffin
Mutter
Openbox
pekwm
Plasma Mobile
Plasma Nano
Puppy JWM/ROX Desktop
Qvwm
ratpoison
Sapphire
Sawfish
sdorfehs
SithWM
Stardust XR Server
StumpWM
Sugar
Tiling Assistant
Trinity Desktop Environment (TDE)
TWin (Trinity Window Manager)
UKUI
UKWM
Untangler
UWM
Window Maker
WindowLab
Xfce
xfwl4
Xfwm4