Emacs. Forever Emacs. :-) In all seriousness, it depends on what I'm doing. Like Kent said, PayPal does allow you a fair amount of autonomy in what software you use to do your job. Lately my main tools have been Atom, Chrome, and iTerm2 -- but I also keep a copy of things like SoapUI, Eclipse, Android Developer Studio, Xcode, and XMLSpy for doing other, more specialized tasks.
