Scribus is an open-source program that brings professional Desktop Publishing to Linux/Unix, MacOS X, Windows.
http://www.scribus.net/
Project page on Sourceforge
http://sourceforge.net/projects/scribus/
Download
http://www.scribus.net/downloads/stable-branch/
Requires Ghostscript
http://www.ghostscript.com/
Desktop Publishing Software. Must register (free) to get a Serial Number.
http://www.freeserifsoftware.com/software/pageplus/