[Name] License [9wm] MIT [aewm] MIT [awesome] GPL [Blackbox] MIT [Compiz] MIT [cwm] ISC [dwm] MIT [Enlightenment] BSD [evilwm] Artistic[2] [Fluxbox] MIT [FLWM] GPL [FVWM] GPL [i3] BSD [IceWM] GPL, LGPL [Ion] LGPL with naming restrictions on modified versions [JWM] GPL [KWin (KDE)] GPL [Matchbox] GPL [Metacity (GNOME)] GPL [Mutter (GNOME/MeeGo)] GPL [mwm (Motif Window Manager)] The Open Group Public License [Openbox] GPL [PekWM] GPL [PlayWM] GPL [Ratpoison] GPL [Sawfish] GPL [sithWM] GPL [spectrwm] BSD [StumpWM] GPL [twm] MIT License [WMFS] BSD [Wingo] WTFPL [wmii] MIT [Xfwm (Xfce)] GPL, LGPL [xmonad] BSD [Name_36] 
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