Rui CarmoCenon is a free GNUstep graphics tool with some unusual characteristics, including DXF/HPGL/PostScript/Adobe Illustrator vector support as well as the usual JPEG/GIF/TIFF/bitmap import:
Cenon is a free GNUstep graphics tool with some unusual characteristics, including DXF/HPGL/PostScript/Adobe Illustrator vector support as well as the usual JPEG/GIF/TIFF/bitmap import: