Surprised to see so many people using Linux - very different to the Ruby world where most people seem to be using OS X.
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Arch Linux + i3 WM, what else?
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OSX 10.10.5 (using vagrant linux box for phoenix dev env). Haven’t made the switch to El Capitan yet.
Windows at work.
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Linux Mint Cinnamon 
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Ubuntu Linux 14.04 using GDM and i3-WM.
Sometimes I do have to do some university-stuff under Windows¹, but then there is always a Virtualbox running a Linux for everything else.
¹ I have to do a small Delphi-Project during the weeks between exam- and lecture phases every semestre.
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OS X 10.11.3 (El Capitan)
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Dabbled with them all settled with OS X.
(This is an important security notice for Mint users)
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Debian testing which is called stretch for now. And there is one inconvenient thing about it: one have to use packages from 2 different branches (sid and jessie) to install erlang-esl and elixir properly.
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ubuntu as virtual maschine on my desktop,
and a cloud9 workspace on laptop
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I am a longtime Linux Mint user (Cinnamon) but have recently switched to Manjaro (based on Arch). I like the access to newest packages and the community packages on the AUR save me a ton of time building various packages from source. Not as novice-friendly as Mint but a great distro for experienced Linux users (I use Cinnamon there too).
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Arch Linux + Xfce
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I’m split about 50/50 between OSX on my Macbook Pro and Arch Linux on my desktop
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OSX El Capitan, and occasionally ubuntu.
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Fedora
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OS X (Macbook Pro) + Win 10 (HP EliteBook 840)
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Ubuntu / Debian
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Developing FreeBSD / MacOS … Testing Servers are Ubuntu-14.04-ARM Server
Ubuntu 14.04 on a DigitalOcean droplet, with tmux. That way I can dial in from whatever machine I’m on and pick up where I left off. 
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OS X El Capitan version 10.11.4
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OS X El Capitan.
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