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PortmasterZoneAlarm
Freemium

Free and open source under the GPL 3.0. Network history search, per-app bandwidth and the…

 Freemium

Free firewall and free antivirus, with paid security suites.

Windows, Linux Windows, macOS, Android, iOS
  • Blocks known trackers and malware with no configuration
  • Live list of every connection, attributed to the program that made it
  • Free outbound firewall that controls program network access
  • Free antivirus option
  • Windows and Linux only
  • Network history search and bandwidth figures are paid features
  • Most extra protections require a paid suite
  • Closed source
Downloadable app Downloadable app
Open source Closed source
License: GPL-3.0 License not stated
No account needed Not stated if an account is needed
Works offline Not stated if it works offline

Checked September 21, 2026

Checked October 1, 2026

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