In France, two radios stations are playing French Rap:
Skyrock is a French radio station based in Paris which is dedicated to mainly rap music and hip-hop.
Listen to French Rap Radio Skyrock
Generations (also known as “Generations 88.2″) is also dedicated to rap music and hip-hop. They also play R’n’b and Reggae music.
Listen to French Rap Radio Generation 88.2 (you will have to register for free)