River is a non-monolithic Wayland compositor. Unlike other Wayland compositors,
river does not combine the compositor and window manager into one program.
Instead, users can choose any window manager implementing the
river-window-management-v1 protocol.

Note: river is currently early in development. Expect breaking changes
and missing features. Bugs should however be rare at this point, if
you run into one don't hesitate to open an issue upstream.