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Lockdown' open source firewall app leaps from iOS to Mac, blocks app and website trackers for free - 9to5Mac
GitHub - doug-leith/appFirewall: A free, fully open-source application firewall for MAC OS High Sierra and later. Allows real-time monitoring of network connections being made by applications, and blocking/allowing of these per app
What is a good free firewall for Mac OS that can transparently manage both incoming and outgoing connections like the one in Windows? - Quora
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