Nice Côte d'Azur is a metropolis with a strong dynamism, vision and proven experience in the adoption of innovative technologies.
To register as a developer http://opendata.nicecotedazur.org/data/fr/user/login
You can then browse the data sets by thematic (some of them are geojson) http://opendata.nicecotedazur.org/data/dataset
And use an API to get for example the location of the parking's in the Nice City.
http://opendata.nicecotedazur.org/data/dataset/cartographie-des-parkings-de-la-metropole
You can issue a GET request on the URL http://opendata.nicecotedazur.org/data/storage/f/2014-06-24T18%3A05%3A16.198Z/carto-parkings.geojson and get the location and name of the parlings in geojson.