GerbMagic

GerbMagic is a viewer for Gerber RS-274x and Protel ASCII PCB (Protel v2.5 to v2.8 formats). It can also convert Gerber RS-274x and Protel ASCII PCB to PostScript, PDF, TIFF, BMP and RID formats.

If you have an image setter which supports either PDF, PostScript, TIFF, BMP or RID, you can plot Gerber and Protel PCB files with the help of GerbMagic.