OpenSnitch
OpenSnitch is a free firewall program for Linux computers that asks you before an app connects to the internet, and lets you allow or block it. It is for everyday Linux users who want to see and control which programs send data out.
How hard it is to start using it. Easy: install it like a normal app, or use it in your browser. Advanced: you run it on your own server, use the command line, or it is a tool for developers.
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The project has not said how it feels about AI-written contributions. Maintainers can set this by claiming the listing.