Sooner or later, somebody is going to ask about an electrical motor as the primer mover.
Or not; maybe everybody realizes that until something better than batteries comes along, electricity is never going to beat gasoline on a HP/lbs basis, which is the bottom line for most people.
Ask me? I think we should be putting some more money into small-scale fusion power. But I don't know anything, so nobody would bother asking me in the first place!
Two other motor applications for your list: the electrical side of hybrid car engines, and the regenerative braking equipment in same. Yes, I know those are more like alternators, but the parts and the principles are very similar.