Collaborative environment for developing documents
Edukalibre is a project funded by the European Commission under the Socrates/Minerva program, to promote information and communications technology in education.
The main goal is to explore new ways of producing educational materials, based on the practices and procedures observed in libre (free, open source) software development.
Find more information and try the system at http://edukalibre.org/. The formats are Latex and DocBook. There is integration with the learning management system Moodle. Conversion to HTML and PDF is reported to be available.