If you have (technically) questions let me know here or in our forum https://discuss.graphhopper.com/t/graphhopper-0-7-0-released...

GraphHopper is an extremely impressive development - and it's open source (APL2.0): https://github.com/graphhopper/graphhopper

What I still dream of is support for public transport/timetable routing (GTFS). That would be great.

more osm routing services:

http://wiki.openstreetmap.org/wiki/List_of_OSM-based_service...

nice comparison/analysis of OSRM, ArcGIS, Google Maps and GraphHopper

https://iliauk.com/2016/02/23/millions-of-distances-osrm-pyt...

Slight off topic. Does someone know a quick way to enter large amount of detailed traffic counts (say around 300 intersections, counted in every lane and every possible turn), and can routing engine and OSM data help? Is there any specialized software that can be used for this type of data entry?

The one thing that I really wish GraphHopper could add (though I doubt they will, because there's no open sources of data for it) is routing via traffic information - both a) routing around traffic jams and b) giving an ETA based on current conditions instead of optimal ones.