No Red Ink is a fantastic free site for students to help improve their writing and grammar skills. NRI uses differentiated learning so it adapts to student's needs and focuses on the areas they need help in. Also, NRI focuses on a student's content area interest to keep writing interesting and exciting. Finally, teachers can use NRI for testing and assessing a student's needs as well as generate maps/reports for student/class tracking.
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For another excellent site for Writing, I recommend checking out BoomWriter.