The best replacement for fusion is fission.

The best alternatives to fusion are rated as following:
★★★★★  fission
★★★★★  parallels
★★  malibu
★★  camry
★  mach 3
★  accord
★  sonata
★  focus
★  taurus
★  optima
★  sandy bridge
★  toyota camry
★  prius
★  chevy malibu
★  nuclear fission
★  honda accord
★  proglide
★  parallel
  parallels 6
  ankle replacement
  melting
  altima
  nissan altima
  pocket informant
  php
  escape
  fission in the sun
  xunity
  fusion pro
  mazda6
  vaporization
  disc replacement
  boot camp
  ford focus
  jetta
  fusion hybrid
  mercury milan
  hyundai sonata
  nuke
  cruze
  parallels mac
  parallels for mac
  pjanoo
  virtualbox
  fiesta
  city lips
  mazda 6
  camry 2014
  gens
  impala
  fusion proglide
  shake
  toyota prius
  camry hybrid
  gemination
  milan

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

Other search terms related to fusion and their ratings are:
★★★★★ instrumentation
★★ fission
★ bmp
decompression
discectomy
pedicle screws and rods
You have in mind a companion for fusion and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of fusion in all years. Click on graph for more.
fusion
fission
parallels