As part of this team project for my CS 307 software engineering course, we developed a collaborative editor plug-in for the Eclipse environment. Users are able to share source code files with other users, who can view changes made to a document by other users in real-time, and make their own viewable modifications.
The plug-in integrates seamlessly with the Eclipse IDE, and features an independent server that can be run on any port-forwarded connection. Future versions will support additional editors, with more customizable features.
Test-drive the plug-in and browse the source code at our project homepage, hosted on Google Code here.