xfwm4 - 4.18.0-1+b2 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.
.
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.