X2Go Server's X2Go KDrive Xserver

 X2Go is a software suite that uses NX and/or KDrive technology for
 remote desktop computing.
 .
 X2Go KDrive technology implements a remote X11 Xserver backend for
 modern desktop environments, namely desktops derived from the GNOME
 desktop shell.
 .
 X2Go KDrive does not require an XServer on the client side, only the
 X11-independent x2gokdriveclient. Desktop session data transfers from
 server to client use differential image compression and image data gets
 cached client-side.