CommonLit

CommonLit is a nonprofit education technology organization dedicated to ensuring that all students graduate with the reading, writing, communication, and problem-solving skills 

It offers free instructional materials created by teachers, for teachers to support literacy and critical thinking development for students in grades 5-12.

You can search and filter their collection (by lexile, grade, theme, genre, literary device, or common core standard), share it with your students, and track progress.

Registration is free

https://www.commonlit.org/en