data.gouv.fr is the French state's catalogue of public datasets, a product of the Direction interministérielle du numérique (DINUM). Its menu separates Données (the jeux de données, or datasets), Réutilisations (projects built on the data) and Organisations (the producers). Each dataset page has tabs for its files, its reuses, its Discussions with users and an Informations panel of metadata.
The producers range widely. National bodies publish reference sets such as the Demandes de valeurs foncières (DVF) and the Plan Cadastral Informatisé of the Ministères économiques et financiers, the Sirene files of companies and establishments from Insee, or the road accident databases of the Ministère de l'intérieur. Collectivités territoriales publish local data, and companies, associations and individual users publish as well.
For a buyer, what matters is that the catalogue moves. Datasets are created and files replaced on rhythms as different as DVF, refreshed in April and October with every earlier file replaced at once, and an Insee polling-station file announced for renewal every five years. Metadata scores shift, and reuses and discussions pile up.