The best replacement for nd is md.

The best alternatives to nd are rated as following:
★★★★★  md
★  nmd
★  do
★  bc
★  polarizing filter
★  th
★  miami
★  msu
★  polarizer
★  polarizer filter
★  cpl
  cpl filter
  mandan
  polarising filter
  gnd
  grad nd
  al
  marquette
  graduated nd

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Speaking about nd, one probably shouldn't forget about waterslides.

Other search terms related to nd and their ratings are:
★★★★★ waterslides
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md
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