Wikipedia
Scribus
Scribus is a desktop publishing (DTP) application, released under the GNU General Public License as free software. It is based on the free Qt toolkit, with native versions available for Unix, Linux, BSD, Mac OS X, Haiku, Microsoft Windows, OS/2 and eComStation operating systems.
Scribus is designed for layout, typesetting, and preparation of files for professional-quality image-setting equipment. It can also create animated and interactive PDF presentations and forms. Example uses include writing newspapers, brochures, newsletters, posters, and books.
Books about Scribus are available in several languages, including an official manual for v1.3, published through FLES Books in 2009.