Gobby is a free collaborative editor supporting multiple documents in one session and a multi-user chat. It runs on Microsoft Windows, Mac OS X, Linux and other Unix-like platforms.
Sophie is software for writing and reading rich media documents in a networked environment. Sophie’s goal is to open up the world of multimedia authoring to a wide range of people and institutions and in so doing to redefine the notion of a book or
L. Denoue, J. Adcock, S. Carter, and G. Golovchinsky. HT '09: Proceedings of the Twentieth ACM Conference on Hypertext and Hypermedia, New York, NY, USA, ACM, (July 2009)