Toasters, possibly like in one's kitchen. Most of these aren't “smart”, but the ones that are, either have no information, or are silly hacks like below. As the below is a hacked normal toaster, it will not count against the general platform/OS determination.
housed inside the empty space of a standard two slice toaster
This little NetBSD toaster is just a normal toaster with a hardware mod, but the fact that it legitimately uses NetBSD to interface is quite impressive for this hack.
https://hardware.slashdot.org/story/05/08/11/1754253/the-netbsd-toaster
https://www.embeddedarm.com/blog/netbsd-toaster-powered-by-the-ts-7200-arm9-sbc/