The best replacement for daemon is demon.

The best alternatives to daemon are rated as following:
★★★★★  demon
★★★★  alcohol
★★  service
★★  poweriso
★★  cron
★  nohup
★  bagger
★  background process
★  alcohol 120
★  daemon
★  service linux
★  alcohol 120%
  hexer
  malomyotismon
  hexer gta 5
  daimon
  virtual clonedrive
  magicdisc
  process linux
  power iso
  hexadecimal

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Speaking about daemon, one probably shouldn't forget about yasu.

Other search terms related to daemon and their ratings are:
★★★★★ yasu
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Google Trends

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daemon
demon
alcohol