KDE's window manager
KWin is an easy to use, but flexible, composited Window Manger for Xorg windowing systems on Linux. Its primary usage is in conjunction with a Desktop Shell (e.g. KDE Plasma Desktop). KWin is designed to go out of the way; users should not notice that they use a window manager at all. Nevertheless KWin provides a steep learning curve for advanced features, which are available, if they do not conflict with the primary mission. KWin does not have a dedicated targeted user group, but follows the targeted user group of the Desktop Shell using KWin as it's Window Manager.
These details are provided for information only. No information here is legal advice and should not be used as such.