Mac, Linux, Windows, FreeBSD variant (all at work. At home, Linux)
IOS (tablet), Android (phone)
Linux in my television, Tivo, and game console.
Whatever the heck RTOS runs my car, car's GPS, my work telephone, microwave, the badge-swipe system at work, and my work monitor (no, not joking. Darn thing can lock up, and has a boot screen)
That's all I'm coming up with on a daily basis.
Less often, ATMs, routers (Mostly linux), NAS devices, smart-switches (didn't seem like a linux box, but had some copyright lines in the packaging) and anything else with a UI more complex than a mechanical watch. Increasingly, EVERYTHING has an OS: I'm sure it won't be long until someone finds a reason to put a fancy UI on a charcoal grill; and then all future grills will have an OS.