Lulu. A fully open-source firewall for macOS

LuLu is the free, shared-source macOS firewall that aims to block unknown outgoing connections unless explicitly approved by the user. Any unknown outgoing connections, until approved by the user, are blocked by default. While it was designed to generically detect malware by flagging unauthorized networking connections, LuLu can also be used to block OS components or 3rd-party applications from transmitting[…]

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