A coat with a phone pocket. If you have something shaped like a Nokia 3210, you can actually use that pocket. Modern phones are the exact wrong shape to fit in there.
A Minidisc player. First, music went to mp3 players and then it went completely online. Fortunately I sold that thing while it still had some value.
A battery powered GPS device. It’s just for navigating in the forest, and nothing else. It doesn’t even have a map, so it’s pretty useless while driving.
I have an old dial telephone from the 1940s. A couple years ago I saw an Arduino project to make them dial digitally, but it's not the top item on my bucket list.
Film canisters. People saved the plastic canisters photo film came in because they were so well made, waterproof, airtight, and ubiquitous. They were used in all kinds of DIY designs. I've heard some companies still make them, without the film, for people who need them for crafts. I still have some in the junk drawer.
I have a stereoscopic viewer. Like a desk version of Google Cardboard. You tape down two photos taken from different angles and view them in 3d. It has an adjustment knob like binoculars for your pupil distance, and some legs to hold it parallel to the desk. It’s made for aerial photographs. Maybe I could turn it into a VR viewer.
I've got a film negative scanner. I've also got a big pile of old negatives. I keep telling myself that someday I'm going to scan all those old negatives. We'll see.
I love it and I've poured far to much money into it for something that doesn't come close to the power of making music in a DAW. But I do love it, and it can do some cool stuff that I've not been able to reproduce in a DAW - like random triggers and probability. It's also nice to get away from my computer.
I would make international calls frequently. I would buy calling cards. The process was: dial the 800 number on the card. Enter the id number on the card to use some of its credit. Dial the number to call. Their service would then connect me at a low rate to another country(probably making a voip call).
So I'd set up the 3 speed dial buttons with those. For each new card I'd only have to change the card's unique number.
I had a large collection of antique computers and adjacent technology. Although I lost most of it in a natural disaster 😭. But I still have my commodore 64, vic-20, and 90/00s apple computer collection.
We still have a landline (technically VoIP) phone. There's also a list of important phone numbers written on the fridge. Good for emergencies.
There are few things more nerve wracking than frantically trying to find your cell phone and the number for poison control after your kid just swallowed something they shouldn't have.
I have a handheld analog radio scanner. Once upon a time it was fun to listen to local police frequencies, air traffic control, cell phones and cordless phones and so on.
Everything is digital now, except for the air traffic control so once in a blue moon I might listen to that.
I can do one better than that, I have a battery powered handheld TV that only works with analog NTSC broadcasts and does not have a composite input on it. It's therefore damn difficult to get it to display any kind of picture at all these days. The only way is to broadcast at it with one of those short range toy transmitters, or hack up your own.
I have an old PCI TV tuner card. It predates the digital TV switchover so I have a card that can't be plugged into modern motherboards for which no signals are broadcast. Plus I'm sure there are no 64-bit drivers ever made for the damn thing. At this point it's ewaste.
2 Garmin GPS, one handheld and one for the car. I've been using my phone for directions now for years, but I suppose I'll hang on to both units for a bit longer.
Tape device so you can plug your phone into car stereos that don't have Bluetooth. Some cars just have cd deck/player and no aux input, no Bluetooth. Really new cars will have Bluetooth for phone control. Really old ones with cassette players you could use the tape gadget. Not so much in between.
Old flash drives, that were only like 1gb when that was supposedly sufficient back then.
Headphones with audio jack because most new phones have usb-c ports only now. Although I bought an adapter for only 10 bucks.
A/V cord consoles and devices.
I had a VHS rewinder too. Also that reminds me I had a mechanical "crank" playing card shuffler which would probably be an antique now. Lol.
I have a Blackberry Playbook on my desk that I am trying to figure out how to crack. I also keep my Sharp EL-50 scientific calculator around. We had to buy that specific model because it didn't have a persistent memory. We could turn it off and on in front of the invigilator and they would know there was nothing stored in it.
Nowadays, 99% of camping, hiking, and "survival" equipment is light weight composites that can be better fixed with glue, tape, small needle and thread, or a patch with one of the above. There are very few alternative uses for it that aren't better with a different standard tool.