Grammarly (www.grammarly.com/grammar-check), a free Chrome extension, to help students and teachers catch their errors as they compose emails, engage on social media, and write assignments online.
"Helping kids show what they understand by making their thinking visible should be at the heart of most pedagogically sound technology integration. Chrome apps can help you do just that if you choose the right ones. Here are some of my top picks for achieving this in the Chromebook classroom."