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SDDM

Display manager (login screen) used by KDE Plasma.

SDDM ("Simple Desktop Display Manager") presents the graphical login screen on KDE Plasma and several other modern Linux desktops, authenticates users via PAM, and starts the chosen desktop session. Its themes are written in QML.

It supports both X11 and Wayland sessions and replaced KDM as KDE Plasma's default in Plasma 5.

Debian/Ubuntu: sudo apt install sddm
Fedora:        sudo dnf install sddm
Arch:          sudo pacman -S sddm