Simple Desktop Display Manager (SDDM) is a display manager (a graphical login program) for the X11 and Wayland windowing systems.

[5] SDDM was written from scratch in C++11 and supports theming via QML.

[6] SDDM is free and open-source software subject to the terms of the GNU General Public License version 2 or later.

[8][9] The LXQt developers recommend SDDM as a display manager.

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