Well I am using frequently two latin grammars in French, both secondhand books...
A.-M. Boxus, M. Lavency, Clavis. Grammaire latine pour la lecture des auteurs, (De Boeck-Duculot, 2e Ã©d. 1993)
J.-H. Michel: Grammaire de base du latin, De Sikkel, 4e ed. 1967
There is an online adaptation of the first one(3rd ed., Helas I couldn't find a cheap one of this latest edition) at:
It's clear and well arranged typographically. And there is a combination of Lexique & Dictionnaire named INDEX accompanying CLAVIS.
The second one is more like A&G as it contains many historical comments, which are interesting as well as complicated for a beginner like me.