Weston is the reference implementation of a Wayland compositor, and a
useful compositor in its own right. Weston has various backends that
lets it run on Linux kernel modesetting and evdev input as well as
under X11.
There is also a quite capable terminal emulator (weston-terminal) and
an toy/example desktop shell. Finally, Weston also provides
integration with the Xorg server and can pull X clients into the
Wayland desktop and act as a X window manager.