There is no single right answer to your question. What application you
should use depends on the file format of your graphics.
If you are using PostScript clip art, you'll need an application that
works in PostScript, such as Adobe Illustrator or Aldus Freehand. If you
are going to work with PICT documents, you'll need an application such as
MacDraw II. If you are going to work with bit-mapped graphics, a program
such as SuperPaint or MacPaint will suffice.
You may want to look for a program that is an art catalogger. These are
generally used by people in the Graphics and Design section of desktop
publishing who have large amounts of clip art that is commonly used.
Probably the best suggestion is to contact the company whose program you are
using, and ask them what catalogger works best with their software or the
respective type of clip art or graphic. An example would be to contact Adobe
if you are using Illustrator, or Aldus if you are using Freehand.