jwm - 2.3.7-5+deb11u1 main

Low resource Window manager ideal for older PCs. It uses a minimum of
external libraries, thus very little memory, includes virtual screens,
menubar and root-menu popup.
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JWM is a window manager for the X11 Window System. JWM is written in
C and uses only Xlib and (optionally) the shape extension and libXpm.
It can support some MWM, GNOME, and WM Spec hints. The menu configuration
files are managed in XML format.
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Compared to other light WM, like FVWM or Openbox, the Jwm consumes
considerably less memory while providing the same functionality.