X Window System Display Managers
From Free Knowledge Base- The DUCK Project: information for everyone
Display managers work to initiate the X Window System.
Contents
X Display Manager (XDM)
An early display managers created to serve the X Window System.
GDM (GNOME Display Manager)
A display manager made for the Gnome Desktop Environment.
LightDM
A cross-desktop display manager that works well with desktop environments such as Cinnamon, LXDE, Xfce, and Unity.
SDDM (Simple Desktop Display Manager)
A display manager for the KDE Plasma desktop environment. It uses the Qt (Qt Meta-Object Language) to provide a theme and customization.