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OpenSnitch Is a Host-Based Firewall for Linux Desktops

Named OpenSnitch, the Linux port works on the same principles of the macOS version, being a host-based firewall that notifies users when local apps are attempting to initiate new outgoing network connections. Similar to Little Snitch’s normal modus operandi, when this happens, OpenSnitch will display a popup, asking the user for instructions on how to deal with this new process.