The best replacement for amx is crestron.

The best alternatives to amx are rated as following:
★★★★★  crestron
★★★★  javelin
★★  amov
★★  control4
★★  savant
★  extron
★  amc
  knx
  t-50-2
  amx12t
  creston
  admin
  admin mod
  control 4
  chaffee
  adminmod

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Speaking about amx, one probably shouldn't forget about bots.

Other search terms related to amx and their ratings are:
★★★★★ bots
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Google Trends

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amx
crestron
javelin