Okay.....
Microwave - gets used several times a week, without it my batch cook, freezer method wouldn't work and I'd be forced to eat more junk food.
Slow cooker - I have 2, at times these are both in use, for months, and at others they aren't used for ages (edit - heavy and difficult to manipulate while cleaning) - it depends on what I'm cooking/eating at that time.
Freezer - obvious really but without it batch cooking would be pointless, and I'd have to cook each meal, each time.
Food mixer - I used this extensively for years, using it to take the hard work out of mixing bread dough, make cakes, scones and other baked goods, it even makes sausages (to much work/cleanup IMO), pates, and ice cream.
edit/insert - food processor - for slicing, shredding, making pastes, oddly it's better than my food mixer for making most types of pastry. Whilst useful, for some tasks, it rarely gets used coz it's a pain to clean, for most stuff it's easier to buy pre chopped/sliced veg.
Hand mixer whirly thing - mashes potatoes, whisks (tho not very well - good enough for whipped cream if you're into that sort of thing) and acts as an easy to use in pan liquidiser.
Sofa legs - I bought some 6 inch legs to raise my sofa another 5 inches, coz I couldn't get out of it, they help, quite a bit, and they also made the un-hoover-able zone next to the sofa move to under the sofa.
Overbed table - very useful, I currently use mine in the living room as a coffee table replacement that can swing, and tilt, so when I want to get up it will just swing out of the way, and there is nothing fowling my feet or to hit my shins on.
Tablet - multiple uses, no good as a main pc but for some things, like taking a recipe in the kitchen, banking, reading a book, or ordering a takeaway.....
NAS - I'm fundamentally a very bad person - my NAS holds around 12TB of films, tv series, ebooks, and controls my tv tuners etc. - all of which can be accessed wirelessly from anywhere in my home, and as I found out recently, within about 50m of it.
Washer/dryers - brilliant devices, at times, if you can get them to work.
Backpack - don't know about anyone else. but carrier bags, ow, and a pain in the butt if you use crutches.
Little plastic food containers - make freezing food much less messy
Pyrex cookware with lids - I have loads, useful for, say, making half a dozen smaller shepherd's pies/ macaroni cheeses etc. all but one of which can just be lidded and frozen once cooled.
Probably a lot more.....but I'm fed up with typing and you're probably fed up with reading.....