DXF is what I normally use. SGV also works. The free version doesn't generate DXF anymore but it's under $500/yr or less if you catch it on sale. Inkscape is good for "snipping" files off the interweb and turning them into a bitmap. SheetCam produces a TAP file and I believe it's mach4 that runs everything else. Proma builds the controller that runs the steppers etc. on my machine.
