We had a fancy coffee machine at an old job that ran Linux. If I remember correctly it was a top of line cafection or zulay machine. One of the ones with a touch screen. Just booted off an SD card as well iirc so probably would have been pretty easy to hack on.
I still find it weird that managed switches run Linux as I generally would think that at those data rates they’d need something closer to the metal but with the magic of HW offloading that’s been a thing in enterprise for a while and OpenWRT even supports some consumer grade ones now.
Some (probably most) ebook readers like the Kindle.
EDIT: Totally forgot about these 2 ham radios. You can run and access Linux on both of these. One is by design as its running on a Pi, the other via mod by R1CBU booting the OS from an SD card.