Top 4 windows-firewall open source projects

Simple tool to configure Windows Filtering Platform (WFP) which can configure network activity on your computer.

Windows firewall PowerShell scripts

AdvFirewall Scripts - A Collection of Scripts to Manage your Advanced Windows Firewall.

This Tool blocks a Mass of IP Adresses via the Windows Firewall. You can run in Automatic-Mode using a Abusive IP List like blocklist.de