Spot2Jot is a collaborative writing application. You can create documents online and then share them with other users in your project. Every time you edit a Spot2Jot it saves a new version of the document, so you can go back and see the original version to compare revisions you have made. You can also comment on each Spot2Jot to let other users know if something needs revised. Some paid accounts also allow you to attach to files to your Spot2Jot documents.