stephan75
(stephan75)
2
Look for all opensource applications at http://wiki.openstreetmap.org/wiki/Routing including all sub pages.
geocoding is a field of http://wiki.openstreetmap.org/wiki/Nominatim
and as a developer you should also study http://wiki.openstreetmap.org/wiki/Develop with its subpage http://wiki.openstreetmap.org/wiki/Develop/Frameworks
ask for more infos if you proceed with a certain app …