X11 apps run under XWayland, an X server that runs under Wayland compositors, almost always by default. It's possible to run WMs under XWayland too, but most Wa

X11 apps run under XWayland, an X server that runs under Wayland compositors, almost always by default. It's possible to run WMs under XWayland too, but most Wayland compositors are WMs and handle the WM for XWayland too. Wayland doesn't have a single display server. Most of what was the X11 display server is moved to the kernel and libraries. So, the WMs ARE the display server. xv, xpdf, xterm should work fine. xsnow should work, but will only see X windows. fvwm2, it can run on some Wayland compositors, but the better option here would be a compatible replacement: as far as I know, we still don't have an fvwm2 equivalent, but SwayWM exists as a replacement for i3, for example.