The best way to describe Edmodo is like a Facebook for education. Students are given a code to join my class(es), and they are then able to see what I have posted and are able to comment.Online Writing Lab
This site has hundreds of resources to help with any kind of writing. It is especially helpful for writing research papers.SparkNotes
SparkNotes is a lifesaver for any student! I especially like that it has summaries for hundreds of books, plays, stories, etc.Shmoop
Shmoop is also very helpful for any student. It has great summaries for all kinds of literature along with additional help in other subject areas.