JoeZoo Express is a Google Documents Add-on that can save you a ton of time when you are grading or editing your students' writing in Google Documents. The way that JoeZoo Express saves you times is by providing you with the ability to store canned comments to insert directly in your students' work. You can use standard comments provided by JoeZoo Express or you can create, store, and use your own comments. Additionally, JoeZoo Express offers an option to include links to tutorials and help pages in your comments.
In June JoeZoo Express published a new set of tutorials for teachers and students. The playlist of tutorials is embedded below.