w9wm 0.4.2-8build1 (arm64 binary) in ubuntu bionic

 w9wm is a small window manager. It can be used to imitate the
 appearance expected from a plan9 conforming desktop.
 .
 It shares most of its appearance with the window manager 9wm,
 from which it descends. It provides some additional features
 such as support for virtual screens as well as keyboard bindings.