I use all of these so I upvoted all of them.

At home I use a Windows machine, two Arch Linux boxes, and an ARM Arch distro. I have a VPS with Ubuntu on it. At work I mostly use FreeBSD as my workstation and the production server cluster uses it. We have an ubuntu box in there somewhere too. Most of the office is using mac, so if the mood strikes me to go mobile with a laptop I pick one up from a stack of the things and wonder around with a mac. My hacker space has some old sparc machines I was thinking of grabbing... but I don't need another nightstand.

If you asked me this a few years ago, I'd say I used z/OS quite a bit too.