The best replacement for massive is fm8.

The best alternatives to massive are rated as following:
★★★★★  fm8
★★★★★  sylenth
★★★  alchemy
★★★  zebra
★★  operator
★★  sytrus
★★  es2
★★  harmor
★★  reaktor
★★  dapper
★  absynth
★  zebra 2
★  largo
★  monark
★  omnisphere
★  fine wire
★  sylenth1
  fine wire plugs
  albino
  nexus 2
  razor
  hard haunted mansion

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

Other search terms related to massive and their ratings are:
★★★★★ ableton
★★★★★ fl studio
★★ ableton live
★ fruity loops
★ ableton live 8
★ maschine 1.8
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Google Trends

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massive
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