The best replacement for alarm is windows firewall.

The best alternatives to alarm are rated as following:
★★★★★  windows firewall
★★★★★  norton
★★★  comodo
★★  alert
★★  adt
★★  immobiliser
★★  mcafee
★★  harm
★★  1mr
★  setitimer
★  cctv
★  passive alarm
★  norton internet security
★  smoke detector
★  alarm
★  viper
★  lojack
  timer
  clifford alarm
  non passive alarm
  life alert
  cameras
  fire alarm
  trend micro
  comodo firewall
  sygate
  detector
  chime
  black ice
  hardwire
  wired
  pc cillin
  python alarm
  adt alarm
  carbon monoxide
  outpost
  windows 7 firewall
  norton antivirus
  wireless
  zone alarm pro
  norton firewall
  active alarm
  central station alarm
  kaspersky
  mcafee firewall

Your alternative for alarm is not listed? Suggest!
Speaking about alarm, one probably shouldn't forget about remote start.

Other search terms related to alarm and their ratings are:
★★★★★ remote start
★★ pager
★★ vibrate iphone
★★ power locks
★ turbo timer
★ snooze iphone
★ do not disturb
shock sensor
auto dialer
keyless entry
central locking
You have in mind a companion for alarm and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of alarm in all years. Click on graph for more.
alarm
windows firewall
norton