The best replacement for monitors is speakers.

The best alternatives to monitors are rated as following:
★★★★★  speakers
★★★★  headphones
★★★★  crt monitors
★★★  lcd monitors
★★★  tvs
★★  semaphores
★★  widescreen
★★  digital monitors
★★  computer speakers
★★  hi fi speakers
★  celestials
★  bookshelf speakers
★  crt
★  headphones mixing
★  one large monitor
★  monitors
★  floorstanders
★  hifi
★  hi fi
★  passive
★  lcd
★  side by side monitors
★  projectors
  low self monitors
  led monitors
  full range speakers
  arm monitors
  floor standing speakers
  flat panel
  inner ear monitors
  tv monitors
  hi-fi speakers
  non powered floor monitors
  stereo speakers
  televisions
  ovulation predictor kits

Your alternative for monitors is not listed? Suggest!
Speaking about monitors, one probably shouldn't forget about displayport.

Other search terms related to monitors and their ratings are:
★★★★★ displayport
★★ one computer
★ eyefinity
★ audio interface
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You have in mind a companion for monitors and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of monitors in all years. Click on graph for more.
monitors
speakers
headphones