The best replacement for nik software is topaz.

The best alternatives to nik software are rated as following:
★★★★★  topaz
★★★  onone
★★★  vsco
★★  onone software
★★  lightroom 5
★  perfect photo suite
★  lightroom 4
★  dxo

Your alternative for nik software is not listed? Suggest!
Speaking about nik software, one probably shouldn't forget about aperture 3.

Other search terms related to nik software and their ratings are:
★★★★★ aperture 3
★★ capture nx2
You have in mind a companion for nik software and it is not yet here? Propose!



Google Trends

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nik software
topaz
onone