We just upgraded to the latest version of Etherpad and it is a really nice improvement. We were able to add several plugins such as file attachments, Speech to text, and Headings. Etherpad is a collaborative document editor that allows you to work in real time. It is very similar to Google Docs. The biggest benefit is that we have this integrated with Moodle. Using Moodle a teacher can provide an Etherpad activity and students in the Moodle course can use it to collaborate on projects and work.
Etherpad – https://etherpad.org