a short length of bicycle chain

Titanium multipurpose carabiner, ruler, wrench, bottle opener, flathead screwdriver. Handy for like $5 a decade ago.

A quick release keychain, it releases from a simple multi purpose carabineer. (Yes I know - the carabineer function is for my belt loop, the quick release is really what it is named for)

Swivel-Eye Bolt Snap Hook

I just have a key ring that I attached my first dog’s nametag to. It says Adventure Dog on the front, it’s nice.

A wire with a screw. Like the aviation industry.

Big chunky carabiner. Also it’s green.

I only have a bottle opener, and I only have it because my beer distributor didn’t sell any other kind of bottle opener.

Brass #2 boat snap

Still just the default one.

I like how everyone’s answering another question, like OP asked “What do you keep on your keychain besides your keys?” Because none of those things would hold keys. The hole’s too small.

Now, like, the guys saying carabiner clip, you couldn’t put keys on something like that, but you could put one on your keychain so you could clip it to your belt. Useful if you want to keep your keys from scratching something in your pocket, I suppose. Also keeps your pockets less cluttered.

I’ve got three right in front of me. A fourth one is on my AirPods case. So yeah, definitely have them.

A cute squirrel that seems all innocent but actually is also a bottle opener

I made a seine twine monkey’s fist for my keys

Snap hook

I don’t have a keychain. I try to avoid keys, and most things I need a key for any more have electronic keys. The few things I need physical keys for any more just have that single key on a lanyard, and I’ll just grab that specific key when I need it.

I’d say around 80% of then time, I don’t have any keys with me at all.