French rap?

Depends on what you are seeking
most of the main stream french rap is kinda trash but the biggest group are :

Biggest impact on french rap :
IAM -L'ecole du micro d'argent (album)
NTM - Police

Some good lyrical ones :
Nekfeu
Orelsan - first two albums and his duo with Gringe : Casseurs Flowteurs

Weird ones but best of them all :
Stupeflip - All albums apart from StupVirus