Read this page first for a lot of background information about cycling in the French mountains – in particular the Alps and Pyrenees.
Cycling in the French Alps
Cycling in the French Pyrénées
Cycling in other parts of France
Links and Other Clicks
Michelin Map. A wonderful online map.
Geoportail. Excellent but slow French maps.
ClimbByBike‘s web site where you can see profiles of many, many climbs.