Litterature Audio is an excellent site with free audiobooks in French. You can download the audio files as well as the text version.
Excellent titles read by very good voices, like Victor Hugo’s Les Misérables, or many of Jules Verne books, and short stories like Ali Baba et les Quarante Voleurs, or the Conte Du Pêcheur Et Du Voyageur and many more .
I use Moon+ Reader for reading the text version while hearing the audio by creating a virtual podcast on Beyond Pod.