XDM is described as '(in full, the X Display Manager) is the default display manager for the X Window System. It is a bare-bones X display manager. It was introduced with X11 Release 3 in October 1988, to support the standalone X terminals that were just coming onto the market' and is an app in the development category. There are more than 10 alternatives to XDM for Linux, BSD and Xfce. The best XDM alternative is Ly, which is both free and Open Source. Other great apps like XDM are LightDM, SDDM, emptty and SLiM.
Minimalistic, yet full-featured display manager that provides a fast, dialog-based login system without the overhead of the X Window System. Written in pure bash, CDM has almost no dependencies, yet supports multiple users/sessions and can start virtually any desktop environment...
Wraps standalone Wayland compositors into a set of Systemd units on the fly. This provides robust session management including environment, XDG autostart support, bi-directional binding with login session, and clean shutdown.
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