Victorinox Tinker knife. I feel nekkid without it.
slmjim
I like small to medium sized handheld powder actuated tools. I use them to prevent myself from having to go to the hospital for reconstructive surgery, when I step out onto the public street.
Probably my 18 v Dewalt hammer drill. It has driven thousands of screws.
magnifying glass.
Not my most used, but definitely a favourite, Bahco 31. Solid enough to wallop with a hammer or put a piece of scaffold pipe onto to turn a rusty nut, with the added bonus of a pipe grip. When I was plumbing on ships, this would be in my pocket daily.
My EnZo camp knife
Nice that. Enzo make some lovely, understated, and great value knives.
Thanks. Yes, these Enzo’s have fantastic steel, and understated like you say. No reason to spend huge money on some boutique knife. It’s hard to believe they are as inexpensive as they are. I mean, not chinese inexpensive, but I’d put this up against any $400 boutique knife of the same type
Opinel number 6. Super easy to sharpen and is fantastically cheap.
The “fixer” in my two-member household is actually my wife. She can fix almost everything. Just two days ago she put new glue to repair my walking shoes.
I use my big and very sharp scissors to unbox packages. And I have a tiny Swiss knife with scissors on my keychain, which I have used quite often while going out.
“What’s your most used/favorite tool beside flashlights?”
For most guys, that’s a very personal question. 
My Smartphone
I have a special relationship with my grinder. (this is not my grinder…photo borrowed from the googlers.)
That’s a really beautiful fixed blade, Robert! I wasn’t aware of this brand before. Will have to look it up. 
Difinately my saws, most days I’m behind a chainsaw.
I almost always carry an assisted-opener.
My very favorite is the...
Kershaw Payout 2075!
A simple whetstone, like this (picture borrowed from AZ).
EVERY piece of a light that I can make a bit flatter gets a spin.
Led-boards, shims, retaing rings, the ends of bodies/tubes, et cetera.
And of course my collection of (old) garden tools, almost every time I use them.
BTW, collection is just a politically correct word for pile or heap.
Leatherman Blast.
I have a Leatherman Blast, but I don't like it.
I much prefer my Leatherman Wave, though I don't use any of my multi-tools very often.
My favorite budget multi-tool is my Xiaomi 16-in-one.
It seems to be almost as good as my Leatherman Wave.
Then there's the Xiaomi 13-in-one.
It's also very nice, and even cheaper.
The multi-tool I use the most is my keychain Leatherman Squirt PS4.
It's really expensive for what it is, but nothing else comes close (except other Leatherman keychain multi-tools.) 