Some of the plugins for it are pretty interesting. We have a Brother embroidery machine in our work Makerspace, and it ends up there's an Inkscape plugin (called Inkstitch) to create command files for the machine. It's like working with a slicer for 3d printing, but more about changing thread than filament, plus how stitches should be oriented and such.
Yes! I use an Inkscape extension to send my own designs to a vinyl cutter that works perfectly well but has LONG since stopped being supported by its manufacturer or any other closed-source tools.
I'll have to see if I can get this working with our vevor vinyl plotter, as ink cut hasn't worked for a long time now and there doesn't seem to be any way to use the aliexpress/vevor vinyl plotters without paid proprietary software currently.