Mike Ousby is the (world's) main man for this.
Don't forget though that tramway in French is not the same as in English.
Le tramway can often mean just a light railway.
Some French 'tram' loco makers.
The most prolific probably Blanc Misseron. (also built Tubize design under licence)
Then Decauville - especially les tramways betraves, Clavados etc....
Tubize, ANF, Lamm and Franq. These 3 had strong Franco-Belgian connections and seemed linked in history and design.
A few others that produced railcars/automotrices, Turgan et Foy, Purrey.
There are more and I will think of them later.
And from the Uk but used in France,