Phd grants are available in the labs members of CHL. You can check out thesis propositions:
At Irmar in Rennes
At Lmjl in Nantes
At Lmba, contact researchers directly in Brest and Vannes
At Larema in Angers
The doctorate school MathSTIC provides information to phd candidates and can help regarding training and founding.
Offers in the CHL labs are mainly published here.
You can have look and contact current phd students. Lebesgue doctoral meetings are organised each year so that Phd students get to know each other and interact on the CHL perimeter. See previous editions.