I stumbled on the graphis program Cenon <http://www.cenon.info>, which claims to have DTP functions. It uses the GNUStep libraries. A low-res screenshot can be found here: http://www.cenon.info/images/appleLinux.gif. I find it interesting the program was started way back "in 1993."
From: http://www.cenon.info/body_gb.html: "Cenon owns an enormous range of Import and Export possibilities. This allows the conversion of all supported graphic formats in any other format. The editability of imported data is fully guarantied. Conversion of the formats PostScript, PDF, DXF, HPGL, Gerber, DIN formats and other formats are solid part of the Import- and Export libraries of Cenon."
