Frei and Borel sell a swiss made combination tool called Profiform.
it's first off, a straight sheer for sheet metal, which gives
unusually straight edged cuts with a minimum tool mark. the same
"ram" mechanism that moves the blade, also drives a sort of bending
brake arrangement below the cutter, so in addition to being a shear,
it's also a bending brake. And that same ram, instead of the
bending fingers, can also drive optional punches. The punches and
dies are available in a number of shapes, including square and
rectangle, and I think, ovals. Note that these puppies are quite
pricey. Not at all in the same league as typical disc cutters where
for fifty bucks you get one die block and six or more cutting
punches. These things cost more than that, I think, for each
punch;/die set, plus the cost of the profiform tool itself. But it's
there, if that's what you need.
Also, anyone remember the classic old Roper whitney numbef five hand
punch? that punch has been widely copied with cheap chinese/Taiwan
import copies you can get for ten or fifteen bucks. But the original
company makes many styles of hand driven punches, including those for
shapes other than round. Again, you have to be willing to pay for
them. A lot more complex to make than the typical round punch, so
they cost a good deal more.