Nominatim
Server application for geocoding (address -> coordinates) and reverse geocoding (coordinates -> address) on OpenStreetMap data.
It provides a web service that converts human‑readable addresses into geographic coordinates and, conversely, returns a synthetic address for any latitude/longitude or OSM object. The API can be queried with free‑form text in any language or with structured parameters such as postcode, city, or feature type, making it suitable for both interactive search boxes and bulk geocoding of address lists.
The software is built to run on OpenStreetMap data that can be imported and kept current via regular updates, and it can be deployed on a range of hardware—from a laptop for a single city to a larger server handling planetary data. Configuration lets users select which OSM features to include, and the service is capable of handling millions of queries per day on a single machine.
It is released under GPL‑2.0 (with some components under GPL‑3 or Apache‑2.0), is self‑hostable, free‑tier, and does not require a subscription. Documentation, installation guides, and a community forum are provided for setup and troubleshooting.
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