We have been developing a new platform for the rapid and collaborative development of books. Its called ‘PubSweet’ and will be released under an Open Source license shortly. It is a very lightweight framework for online book development and is intended to be very modular and very simple to use and extend. We have been using it for a while and will clean up the design and a few bugs and get it out there.
It is still very buggy but we made the decision today to use it in all future Book Sprints. Stay tuned!