Plenty of people have CAD files of F-style and A-style instruments. Usually, though, they have developed them for their own use, and don't sell them. Not that they wouldn't, for the right price...
Also, most luthiers are not serious CAD jockeys, and prefer to make instruments rather than make drawings. A good set of plans can easily take as long to produce than an instrument.
So most luthiers use Photoshop, Illustrator, Rhino, and AutoCAD, or some combination thereof.
For serious production work using a CNC, a parametric CAD system is essential. SolidWorks, Creo (formerly Pro/E), or Unigraphics NX. Since these programs are expensive, you won't find them in most small shops.
DraftSight is a free AutoCAD clone. It does everything AutoCAD does, except for 3D. It's a great drafting tool, though, especially if you have previous AutoCAD experience.
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