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Fort Firewallsimplewall
Free

Free and open source.

 Free

Free and open source under the GPL 3.0.

Windows Windows
  • Per-application and global network rules
  • Wildcards and parent-process based rules
  • A plain allow and block list rather than a stream of pop-ups
  • Internal block list aimed at Windows telemetry
  • Windows only
  • Requires familiarity with firewall rules
  • The project itself says it is for advanced users
  • Not a Windows Firewall interface; it uses a separate rule system
Downloadable app Downloadable app
Open source Open source
License not stated License: GPL-3.0
No account needed No account needed
Works offline Works offline

Checked September 24, 2026

Checked September 21, 2026

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