This route: https://cycle.travel/map/journey/782979 

Starting at the westernmost point of France - Brest - to the eastern (nearly) point of France - Nice - is intended to be a French alternative to LeJog. 

The route was suggested by the Cycle.Travel algorithm - now known as AI.

Just as there are with Lejog, there are many routes to chose from between the two towns - this suggested route is just one of a myriad of choices. It has been said that cycling in France offers a different experience to cycling in Britain with less traffic and quieter roads.