My Surface Go 3, a tablet-laptop hybrid running both Windows and Android. I do have two mothballed ThinkPads in my drawer. I don't use them, but I've set them up so that they're ready to go if my Surface breaks or something. I also have a MacBook Pro that needs to be repaired.
Most interestingly: There's my old AlphaSmart. AlphaSmarts are portable smart keyboards, they have a screen at top. You type a document up, then plug the AlphaSmart into a computer, and it will type your document into the computer for you. It can also be used as a conventional keyboard. I've been meaning to dig my old AlphaSmart out, give it Bluetooth, and then use it with my Surface.
My AlphaSmart is a Dana, which means that unlike most, it runs Palm OS. Palm OS was the Android of it's day, it was a common operating system on handheld computers. While all AlphaSmarts are smart keyboards, because mine runs Palm OS, it could also run apps and all. Unfortunately, Palm OS isn't too useful in the modern world. But my AlphaSmart should still work fine as a smart keyboard.