LINK TO SITE
The Primary Pad Chrome app lets teachers and students quickly collaborate on a text document - even without an account. Once the document is set up, it can be shared with a link or even embedded on a blog. Each collaborator is shown in a different color, and each pad can include a chat box. Documents can be imported and exported from Primary Pad, and the Timeslider plays back the process.
The free version lasts for 30 days, which may be just enough time for students to collaborate on a project.