The best replacement for capture nx2 is lightroom.

The best alternatives to capture nx2 are rated as following:
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★★★★  lightroom 3
★★  lightroom 4
★  dxo
★  capture one
★  viewnx 2
★  lightroom 5
★  aperture 3
★  viewnx
★  view nx2
  lightroom 2
  capture nx
  adobe lightroom

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Speaking about capture nx2, one probably shouldn't forget about nik software.

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