Maison du Barbier: a good soap and easy to find in the Carrefour Supermarkets, it's the same as Plisson, it's a good british soap
Altesse: good lather, unscented, you cna find it in hairdressers
Comptoir des savonniers, in the shops of this brand, Comptoir des savonniers is a soap boutique, the shaving soap is discontinued but if you can find it is a good soap
L'othantique in some perfumeries
DON'T BUY: Saponificio Artigianale Fiorentino, that is sold in Galleries Lafayette, the lather dries in seconds.
They have discontinued Comptoir des Savonniers José , It a very fine soap....
As for Roger & Gallet, this contained foaming agents - either SLS or SLES.