The best replacement for windows is mac.

The best alternatives to windows are rated as following:
★★★★★  mac
★★★  linux
★★★  ubuntu
★★  android
★★  doors
★★  puppy linux
★★  freebsd
★★  apple
★  unix
★  linux hosting
★  mac os
★  linux server
★  android phone
  osx
  chromebook
  aluminum windows
  mac laptop
  macintosh
  android phones
  vinyl windows
  os x
  pella windows
  mac operating system
  wood windows
  linux operating system
  mac for gaming
  linux security
  dos
  android cell phones
  windows pro
  linux web hosting
  new construction
  mac which is better
  ios
  aluminum
  android tablets
  mac operating systems
  palm
  mac market share
  new windows
  ac
  droid
  anderson windows
  siding first
  apple mac
  mac 2013
  vinyl

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

Other search terms related to windows and their ratings are:
★★★★★ screens
★★★★★ curtains
★★★★ blinds between the glass
★★★ virtualbox
★★★ shutters
★★★ vmware fusion
★★ bootcamp
★★ boot camp
★ many features
★ between the glass blinds
★ gui
★ walls
You have in mind a companion for windows and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of windows in all years. Click on graph for more.
windows
mac
linux