I use Linux (especially ubuntu, especially xubuntu). I work primarily on the LAMP stack (PHP), which obviously means I do a tonne of work on Javascript and Jquery.

I have been meaning to switch over to thew new stuff (Angular or React or .. some new age cool thing) but haven't had the chance as I have been maintaining our legacy system (circa 2012, LAMP - on Yii) ever since)

I would love to be working on some functional language (espcially Erlang or Haskell or maybe even Lisp) but I need to find time for it.

I would also love to get back into AI (back when 'machine-learning' was a brand new concept)