xfwm4 - 4.12.5-1 main

This package contains xfwm4 which is the window manager for Xfce4. It is
designed to run with the rest of Xfce4 but makes a capable window manager
for GNOME or KDE.
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Install xfwm4 if you want a small, resource saving window manager which
complies to the standards defined at http://www.freedesktop.org/. Without
xfce4 installed this only gives you a window manager not the full
environment.