The best replacement for zone alarm is norton.

The best alternatives to zone alarm are rated as following:
★★★★★  norton
★★★★  windows firewall
★★★★  comodo
★★★  mcafee
★★  online armor
★★  kaspersky
★★  avg
★  avast
★  sygate
★  bitdefender
★  pc cillin
★  trend micro
★  vista firewall
★  outpost
  comodo firewall
  norton internet security
  zone alarm pro
  windows 7 firewall
  kerio
  windows xp firewall
  norton 360
  ashampoo firewall
  windows defender
  microsoft firewall
  panda
  black ice

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

Other search terms related to zone alarm and their ratings are:
★★★★★ avast
You have in mind a companion for zone alarm and it is not yet here? Propose!



Google Trends

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