The Mediterranean side
The Mediterranean group is the largest one on the site — Hyères, Antibes, Mandelieu-La Napoule, Marseille, Agde and Le Grau-du-Roi, plus Bastia on Corsica. Hyères carries the most boats right now.
The Atlantic side and Guadeloupe
On the Atlantic side the list runs from Loctudy and La Trinité-sur-Mer in Brittany down through Pornichet and Les Sables-d’Olonne, with La Rochelle and its Les Minimes marina, and Le Longeron a little inland. Pointe-à-Pitre and Basse-Terre cover Guadeloupe.
One page per port
Every one of them has its own page with the boats that leave from there, linked from the destinations row on the front page. It is the fastest way to see what is genuinely within reach of the beach you are flying to.