Three days ago I created a route with QLandkarteGT and noticed that the route calculated by the OpenRouteService backend exactly matched the rendered map. This was not the case in the past because of outdated routing data (from October 2012).
After a visit of the website my assumption was confirmed: they have updated the routing data, great! Even better after having visited the Wiki: "Updates will be regular now again."
Many thanks for this service.