vrr-infoscreen (formerly vrr-fakedisplay) shows departures at a public transit stop, serving both as infoscreen / webapp and LED departure monitor look-alike.
It supports most german local transit networks and also some austrian ones.
There's a public vrr-infoscreen service on finalrewind.org. You can also host your own instance using Docker or carton/cpanminus. See the vrr-infoscreen README for instructions.