Here is a list of active uses of the KWayland::Client API. frameworks plasma-framework (for window positioning)
apps: spectacle (for window positioning) kdeconnect-kde (for fake input) yakuake (for window positioning) extragear latte-dock (for window positioning, custom shadow (which could be ported already) and windowmanagement) workspace: kwin unit tests libkscreen breeze (till Qt5.15) oxyen (till Qt5.15) xdg-desktop-portal kinfocenter plasma-workspace plasma-nano kscreenlocker powerdevil kwayland-integration (the backend for kwindowsystem) plasma-phone-components plasma-integration David