The Address API allows you to quickly perform an address search in the French National Address Base (more info at https://guides.etalab.gouv.fr/apis-geo/1-api-adresse.html). It also enables you to associate coordinates with an address ("geocode") according to several criteria.
This module contains the majority of methods from this powerful API. You can learn more about it at https://adresse.data.gouv.fr/api-doc/adresse.