MarkIt

Add custom marks such as trim lines, registrationtargets, and color/gray bars to QuarkXPress.
You do everything else to get your job ready for printing, why not place the press marks too?

MarkIt enables you to create custom registration styles that can be used in place of QuarkXPress's default press-marks. With MarkIt, you can make your pages completely press-ready. Position press-marks such as trim lines, registration targets, and color/grayscale bars by simply dragging them into a proxy of the active document.
You can even customize MarkIt by adding items to it. These What's New
Printing with page alignment (ie. Center) did not work. Fixed.Improved the handling of text marks, especially when used in conjunction with Imposer. Fixed Requirements
PPC, Mac OS 9.1 or later