• Arch Linux: I use Linux every day. Previously I have been using Ubuntu for many years. Now I have switched to Arch + KDE as my main desktop.
• Emacs: I'm a huge fan of Emacs, but I don't hate Vim at all because I use Evil to avoid the well-known "Emacs pinky".
• \LaTeX{}: This is actually the basic skill to survive without Windows.
• Firefox: Having installed so many awesome add-ons in firefox, I just can't resist using it every day…

• C
• Python
• Scala
• Ruby
• Java
• Haskell
• Emacs Lisp
• Javascript
• QML
• C++

echo 'rkqdinbjmzhnbjm.dpn' | tr 'b-z' 'a-x@' # sh

or

%w(716a7063686d61696c40676d61696c2e636f6d).pack %q(H*) # Ruby