The best replacement for apm is acpi.

The best alternatives to apm are rated as following:
★★★★★  acpi
★★★★  pixhawk
★★★  naza
★★★  px4
★★★  pmi
★★★  epm
★★★  multiwii
★★★  prince2
★★  cc3d
★★  guid
★★  npr
★★  kayaba
★★  openpilot
★  kk2
★  dji naza
  wookong
  naza v2
  rp data
  proride
  gab
  apci
  acpi linux

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Google Trends

Scale is based on the average worldwide traffic of apm in all years. Click on graph for more.
apm
acpi
pixhawk