Display Manager
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See also:
http://linux.overshoot.tv/etc/conf.d/xdm
https://wiki.gentoo.org/wiki/Display_manager
https://en.wikipedia.org/wiki/Category:X_display_managers
https://en.wikipedia.org/wiki/X_display_manager_(program_type)
List
List of display managers for which we do not have a dedicated wiki page yet:
KDM - KDE4 display manager, which was unfortunately not ported to KDE 5.
GDM (Gnome Display Manager)
MDM (Mint Display Manager)
SLiM (Simple Login Manager)
SDDM (Simple Desktop Display Manager)
LXDM
LightDM