The best replacement for smoothing is rebonding.

The best alternatives to smoothing are rated as following:
★★★★★  rebonding
★★★★★  filtering
★★★  smoothening
★★  moving average
★★  straightening
★★  juicing
★★  rebonding which is better
★★  straightening hair
★★  straightening which is better
★  rebounding
★  rebonding rambut
★  keratin
  weighted moving average
  supersampling
  hair relaxing
  resource leveling
  linear regression
  arima

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Speaking about smoothing, one probably shouldn't forget about zbrush.

Other search terms related to smoothing and their ratings are:
★★★★★ zbrush
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Google Trends

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smoothing
rebonding
filtering