This map is available on the website of the French Ministry for Culture, and also features the non-Gallo-Romance languages from France.
The French constitution only recognises French as the language of the country. France is a signatory of the European Charter for Regional or Minority Languages, but it never ratified it. In 2021, the Molac Law was adopted and enacted to help promote the regional languages of France.
An interactive map is available here, where you can click on a region to get access to further resources relevant to the area.
See here for resources on the Oïl languages, here for the Oc languages, and here for Francoprovençal.
The Gallo-Romance languages form a group that first-developed in France, Belgium, Switzerland, Italy, and Catalonia. They are now spoken in the Americas, in Africa, and in Polynesia, mainly because of French colonisation.