OpenBooks is a project that aims to collect, create, and maintain professional quality books released under OpenContent style licenses. OpenBooks will solicit new material and old, by cultivating and encouraging new authors, and working with published authors and publishing companies to release existing works under open licenses.
DocBook is the official format for OpenBooks; the project will also offer conversion services to authors not willing or able to learn DocBook.
Metadoc - An XML system for writing fiction and screenplays, including story content, plot management, and character development. Initial support will include DTDs and XSLT stylesheets. Later releases will feature GUI applications for manipulating your data, as well as other content types like technical documentation (as a shorthand format which can be easily transformed into DocBook, but which works around some shortcomings with DocBook, such as better support for external source code inclusion), poetry, and whatever else people want.