OpenSnitch: The Little Snitch application like firewall tool for Linux

OpenSnitch (forked version) screenshot

EDIT: The original developer apparently has abandoned OpenSnitch, however there is a forked version that as of 2021 is still being actively developed. In addition, there is a newer project by a completely different developer called eBPFSnitch. For more information on the forked version, see OpenSnitch Linux Application Firewall Fork With Improvements And Bug Fixes (LinuxUprising)

This is the original article about a very early version by the original developer – the forked version mentioned above is much improved over this one!

OpenSnitch screenshot

Little Snitch is a traditional software firewall for macOS. You can use it to monitor applications, preventing or permitting them to connect to attached networks through advanced rules. OpenSnitch is a GNU/Linux port of the Little Snitch application firewall written in Python.

Source: OpenSnitch: The Little Snitch application like firewall tool for Linux (nixCraft)

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