I have a few bit only 2 are interesting really.
I haven't done anything with either of these yet.
I have this old enox, bought as it was cheap. Done nothing with it. I had planned to use it as a buffer
But just recently I picked this old 10" black and decker up

This has already lost all it's grinder stuff and had some polishing spindles added.
It may be a little slow in the rpm though, but should have a load of torque and it came with some big mops so surface speed should still be reasonably high. Think the grinder is 1500rpm or similar.
I also have a foot powered grinder. A bit like a hand grinder but with a chain linked down to a foot pedal. It's a bit broken though, needs a fair bit of attention. Plan was to sort that and bolt it to the outside wall of the workshop for quick touch ups of the garden tools.
I'll grab some pics of that when I get round to sorting it. I think I may need some advice on that one, if I remember right some of the gears are broken and the freewheel is not in great condition.