CAPTIONmatic for Mac

From SoftCare:

CAPTIONmatic automatically and precisely attaches captions and credits to picture boxes.
Once created, you will never have to bother about them again. Just be creative, CAPTIONmatic will take care of routine matters. If you move the image, the caption moves with it; if you change the image in size, the caption changes as well; if you place the image across the binding margin, the caption is split into two; if you bleed the image, the caption stays within the type area. The caption boxes are taken from a QuarkXPress library–even with formatted dummy text.