https://nominatim.org/

can be installed locally too. open source

depends on

1. • PostgreSQL (9.6+ will work, 11+ strongly recommended) - postGreSQL
2. PostGIS (2.2+ will work, 3.0+ strongly recommended) - PostGIS
3. https://falconframework.org/ - for frontend

read

1. My geography
2. Leaflet

Referenced in:

• geolookup