leaflet
Leaflet — an open-source JavaScript library for interactive maps
https://leafletjs.com/
Open Street Map
Can I use OpenStreetMap to make a town transit map? - OSM Help
https://help.openstreetmap.org/questions/6861/can-i-use-openstreetmap-to-make-a-town-transit-mapCarto'Cité - Agence de géomatique à Nantes
https://cartocite.fr/switch2osm | Make the switch to OpenStreetMap
https://switch2osm.org/overpass turbo
https://overpass-turbo.eu/can i use openstreet map or leafletjs map for commercial app & web use? - OSM Help
https://help.openstreetmap.org/questions/57378/can-i-use-openstreet-map-or-leafletjs-map-for-commercial-app-web-useCan I use OpenStreetMap in a commercial product? - OSM Help
https://help.openstreetmap.org/questions/4669/can-i-use-openstreetmap-in-a-commercial-productCommercial OSM Software and Services - OpenStreetMap Wiki
https://wiki.openstreetmap.org/wiki/Commercial_OSM_Software_and_ServicesIntroduction to OSM for Business Users - OpenStreetMap Wiki
https://wiki.openstreetmap.org/wiki/Introduction_to_OSM_for_Business_UsersDeveloper FAQ - OpenStreetMap Wiki
https://wiki.openstreetmap.org/wiki/Developer_FAQ#Why_don.27t_we_spread_the_load_on_the_OpenStreetMap_database_across_a_number_of_servers.3FNominatim Usage Policy
https://operations.osmfoundation.org/policies/nominatim/Index of /
https://planet.openstreetmap.org/OpenStreetMap Wiki
https://wiki.openstreetmap.org/wiki/Main_Page
free geocoding api
Which are the best geo Coding APIs available for free?
https://stackoverflow.com/questions/8180623/which-are-the-best-geo-coding-apis-available-for-freeOpen Geocoding API - Overview
https://developer.mapquest.com/documentation/open/geocoding-api/
General
7 Geocoding and Reverse Geocoding Services for Pinpointing Addresses [Free and Paid] - GIS Geography
https://gisgeography.com/reverse-geocoding-services-addresses-free-paid/Is There a Geocoding API as Good as Google's? - SmartyStreets
https://smartystreets.com/articles/is-there-a-geocoding-api-as-good-as-googleGoogle Maps API for Business Alternatives and Similar Websites and Apps - AlternativeTo.net
https://alternativeto.net/software/google-maps-api-for-business/