wmanager 0.3.0-2ubuntu1 (armhf binary) in ubuntu impish

 wmanager is a small X11 application for selecting a window manager
 at X startup. wmanager looks for a file named '.wmmanagerrc' in
 the user's home directory which contains a list of window managers;
 you can create such a file with wmanagerrc-update. You can also use
 wmanager-loop that runs window managers chosen by the user until
 told to exit.