MeetingWords is a free and registration-free service for creating an online notepad and chat room. Through MeetingWords you can quickly create an online place to collaboratively create documents with one or more partners. You can chat in real-time while creating a document on MeetingWords. Every person contributing to the documents you build is assigned a highlight color so that you can easily track who wrote what in the document. In the video embedded below I provide a demonstration of how to use MeetingWords along some commentary on how it might be used in a classroom.
If you don't have access to Google Documents or another collaborative document creation tool, MeetingWords provides a quick and easy way for students to take notes together. As I noted in the video, there isn't an option to moderate comments in MeetingWords so you will need to spend some time setting up rules and expectations for your students to follow when using MeetingWords.