Another option is https://www.nitrous.io/app

Fully-featured web IDE; supports Ruby, Python, Go, and more. You provision a box to do your development on.

I've just started tinkering with nitrous.io - I have to say it's very impressive and it makes the chromebook an actual usable device for development out of the box without any tinkering

Good to hear. I haven't actually used it much yet but it's made me consider getting a Chromebook.

Don't have one yet, but are there any window managers with high-resolution support out yet? I may just get a Pixel if there are.

I know Unity hasn't, and Gnome 3 (my favorite) has pixel-doubling support on the way, but if there are any others or if you've been able to optimize an X WM to be readable and polished.

I've been using Openbox with no complaints. My setup is documented here:

https://github.com/appsforartists/pixel_webdev

All I use it for is Sublime Text, so things more-or-less look great for me. The problem with Linux is that there are multiple ways of doing any one thing. So, just because Openbox and Sublime can handle high DPI doesn't mean your run-of-the-mill KDE/GTK app will.

What's VT3?

Virtual Terminal 3. If you press Ctrl-Alt-F2 (forward arrow), you'll get to VT2. You can install crouton and run xinit, which will start a window manager in VT3 (Ctrl-Alt-F3/Reload).

I've got my setup scripted here:

https://github.com/appsforartists/pixel_webdev

I think he means this: https://en.wikipedia.org/wiki/Virtual_console

I would also like to know what vt3 is