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Little Snitch
OpenSnitch
OpenSnitch and LuLu can stand in for Little Snitch.
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2 stand-ins
LuLu
Little Snitch
Instead of Little Snitch. A macOS firewall from Objective-See that alerts when an app makes an outgoing connection, and lets you allow or block it. Security and privacy · GPL-3.0 · macOS · Free
OpenSnitch
Little Snitch
Instead of Little Snitch. A Linux application firewall that asks when a program wants the network, with rules and a desktop UI. Security and privacy · GPL-3.0 · Linux · Free