The best replacement for melodyne is autotune.

The best alternatives to melodyne are rated as following:
★★★★★  autotune
★★★  waves tune
★★★  v-vocal
★★  autotune 7
★★  variaudio
★★  newtone
★★  autotune evo
★★  nectar 2
★  antares
★  flex pitch
★  nectar
★  logic x
★  auto tune
★  reatune
  tune
  beat detective
  logic pitch correction

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

Other search terms related to melodyne and their ratings are:
★★★★★ studio one
You have in mind a companion for melodyne and it is not yet here? Propose!



Google Trends

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melodyne
autotune
waves tune