Scribus – Open Source Desktop Publishing
http://www.scribus.net/canvas/Scribus

Scribus is an Open Source program that brings professional page layout to Linux/UNIX, Mac OS X, OS/2 Warp 4/eComStation and Windows desktops with a combination of press-ready output and new approaches to page design. Underneath a modern and user-friendly interface, Scribus supports professional publishing features, such as color separations, CMYK and Spot Color support, ICC color management, and versatile PDF creation. This will be added to the tools section of Research Resources Subject Tracer™ .