OpenSnitch: The Little Snitch application like firewall tool for Linux

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)

EDIT: The software seems to have evolved since the above article was written. For the most current information go to the OpenSnitch home page and the Github page.

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