Portmaster: Free open-source firewall that shows which apps phone home, 14k stars
alex_verem · x · 2026-10-23
In his open-source security tools thread, alexverem highlights Portmaster, a free open-source firewall (14,000 stars) that shows exactly which apps on your computer are talking to the internet and lets you cut them off per-app.
The same thread covers Pi-hole (61,000+ stars), a DNS sinkhole that runs on a Raspberry Pi and blocks ads, trackers, and malware domains for every device on your home network.
Related event: Open-Source Security Tools: Portmaster Firewall and Pi-hole Ad Blocking(2 posts)→
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