This paper presents Gramex, an application designed to assist teachers in the creation of learning materials, namely grammar exercises. More precisely Gramex leverages state-of-the-art parsing techniques to morphosyntactically annotate texts and turn these into grammar exercises while aligning these with official curricula. Allowing teachers to freely select excerpts of texts from which to generate specific grammar exercises aims to increase learners' engagement in educational activities. Gramex currently supports 4 types of exercises (Fill-in-the-Blanks, Markthe-Words, Single and Mutliple Choice questionnaires) and 3 output formats (JSON objects, printable workbooks, H5P interactive content). Gramex is under active development and has been experimentally used with teachers of L1-learners in elementary and middle French schools.