Been using #Deskflow with my #Debian #Linux #KDE #Plasma #Wayland box as the "server" and my #NetBSD #ctwm #X11 laptop as the "client" or second screen.
It's amazing that it works, but it's buggy. I'll get a few repeat keystrokes, and sometimes the control key gets stuck.
#DontHateTheHashtagPlayaHateTheHashtagGame
