Leaflet und OSM Routing

http://map.project-osrm.org/
https://graphhopper.com/maps/
https://graphhopper.com/#directions-api
Matrix https://github.com/graphhopper/directions-api/blob/master/docs-matrix.md
https://github.com/graphhopper/directions-api/blob/master/README.md
https://github.com/graphhopper/graphhopper/blob/0.4/docs/core/windows-setup.md