How it plugs in
—Public API
NoOpen source
YesFree tier
Signal on Personal firewalls6.2#7 of 17
FAB provides a drag-and-drop interface for blocking or unblocking applications’ internet access through Windows Firewall.

Pricing
- FreewarePortable application · Windows Firewall application managementOn request
- Firewall App Blocker (FAB)No charge; optional donations · Windows Firewall must be enabled · Windows 11, 10, 8.1, 8, 7, Vista (x86 and x64)Free
As sordum.org lists them, checked 22 Sept 2026.