The best replacement for cmc is timney.

The best alternatives to cmc are rated as following:
★★★★★  timney
★★★★★  cmc2
★★★★  pomona
★★★★  geissele
★★★★  pkcs10
★★★  ftf
★★★  mcm
★★  presbyterian
★★  pkcs 10
★★  ig markets
★★  cpc
★  xanthan gum
★  exoto
★  ig
★  mcc
★  face to face communication
  ritek
  tylose
  f2f
  superior steel and supply
  cielab
  presbyterian hospital
  timney trigger
  ig index
  face to face

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

Other search terms related to cmc and their ratings are:
★★★★★ sugarpaste
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Google Trends

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cmc
timney
cmc2