My favourite OS is Linux, but now, after more than 15 years I'm forced to develop on Windows, so it's a new experience for me.
My fav IDE is IntelliJ although I've been using Eclipse for more than 10 years. Anyway I've worked in the past with several IDEs like Sublime Text, Netbeans or Aptana.
Carry on with the flame wars, I prefer Vim over Emacs!
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