From what I can tell, here are the most popular gems for the ten winners:

  haml (8)
  devise (6)
  coffee (5)
  sass (5)
  pry (5)
  sidekiq (4)
  mysql (4)
  honeybadger (4)
  simple_form (3)
  pusher (3)
  bootstrap (3)

It's pretty clear that haml/coffee/sass are just flat out winning, despite all the handwringing.