Hi, "gomorrah" is an italian movie and " l'enfant" is a belgique one. A part these details they are very good movies expecially the last one.

It is always hard to reply to these kind of questions.
I will try starting from three of my favourites french directors:
Truffaut
Rohmer
Chabrol

All of them they made excellent movies, from 1970 to almost our age..

Anyway i could suggest to give a look to this list :
https://mubi.com/lists/top-french-films

Again, in my opinion, it is hard to choose specific movies. The list should be very long.