Quill provides interactive grammar lessons and the chance to learn English grammar by writing sentences and proofreading passages. You can sign up for a quill account by adding your personal information , unfortunately there is no Facebook connect button to save us from a minute of typing.
Once you typed your personal data , you can choose to between a teacher or a student account , if you choose the teacher type , you’ll have the chance to create a class so you can interact with your students. The following video summarizes the key features of Quill.
Quill has over 150 lessons directly from the Common Core State Standards and its completely free. I think it is a good initiative which will bring grammar from textbooks to interactivity. Give it a try and see for yourself.