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Fort FirewallZoneAlarm
Free

Free and open source.

 Freemium

Free firewall and free antivirus, with paid security suites.

Windows Windows, macOS, Android, iOS
  • Per-application and global network rules
  • Wildcards and parent-process based rules
  • Free outbound firewall that controls program network access
  • Free antivirus option
  • Windows only
  • Requires familiarity with firewall rules
  • Most extra protections require a paid suite
  • Closed source
Downloadable app Downloadable app
Open source Closed source
License not stated License not stated
No account needed Not stated if an account is needed
Works offline Not stated if it works offline

Checked September 24, 2026

Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.