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Aside from that I have one of those swivel head 24" craftsman 1/2" drive ratchets that will just about break loose the earth's orbit from round the sun
1/2 Inch S&K deepwell socket. I don't know where it came from as I don't have any other S&K stuff, but I've had it for 20+ years and it has been there for me in a pinch more than any other tool. Kinda odd now that I think about it.
I may have to change my answer to "torque adapters". Make torquing fasteners in inaccessible areas possible. Areas like behind turbos, on spicer life drivelines, behind thermostat housings, basically hard to reach areas. If only I could find a 12 mm from somebody, then I'd be set.
It Has To Be My Pocket Knife. I Feel Naked Without It.
Same with me. Vitronoix 7 function baby pocketknife, even goes to the Symphony! Although my favorite power tool is my B & D cordless 12VDC drill. I use it for just about everything needing a twist.