@CliffWade +1. I checked Linux and ChromeOS, but the more detailed breakdown is:
* #Kubuntu on main laptop
* #Lubuntu or #Xebian on lower-powered laptops
* #Debian or #ArchLinux 32 on 32-bit systems
* Various #Ubuntu flavors on testing laptops as part of development work
* #ChromeOS on my tablet
* Windows 2000 and Windows 98 in virtual machines
* Random odd operating systems in emulators sometimes (#ReactOS, #NetBSD, etc.)