Show Me The Key

Show Me The Key displays your keystrokes on screen for screencasts,
presentations and tutorials. It reads events through libinput, so it
works on both Wayland and X11 (unlike screenkey, which is X11-only).

Because reading /dev/input requires privilege, this snap is split into
a root backend that runs as a system daemon and an unprivileged GTK
frontend. Two manual steps are required after install:

 # sensitive: grants the snap the ability to read all input events

 sudo snap connect showmethekey:raw-input

 sudo snap connect showmethekey:hardware-observe

On a Wayland session the floating key window can't place itself, so
right-click its title bar and enable "Always on Top" and "Always on
Visible Workspace".