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FOSS Firewalls (for Windows)?
(infosec.pub)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
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Complete alternative to windows firewall or a nice GUI for that?
Nicer GUI there's https://github.com/wokhan/WFN
Full firewall I think you would need to run openwrt or opnsense in a VM in hyperv set to run automatically in background at boot