OSRM
project-osrm.orgHigh-performance open-source routing engine
MapRows is google Sheets add-on to geocode addresses, reverse-geocode coordinates and calculate distances in bulk. Here are 20 other tools that do a similar job, 4 of them free or open source.
Custom map styles, vector tiles and location APIs for developers
Microsoft's mapping and geospatial APIs on Azure
Google's maps, places, routes and 3D tiles APIs
Global points-of-interest data and Places API
Free gazetteer of over 11 million place names
Map tiles, geocoding and routing on open data
Enterprise maps, routing, traffic and geocoding APIs
High-performance open-source routing engine
Modular open-source geocoder for open data
Open-source geocoding with OpenStreetMap data
Maps, geocoding, routing, isochrones and places APIs
Maps, search, routing and traffic APIs from TomTom