LuLu

LuLu is a free, open-source firewall designed to block unknown outgoing connections, safeguarding your privacy and Mac. It leverages Apple's Network Extension framework to monitor and control network traffic. Key features include the ability to block unauthorized outgoing connections, alert users to new connections, and provide detailed information about the process attempting to make the connection. LuLu also includes a rules system, allowing users to create fine-grained rules for specific processes or connections. The tool is designed to work in conjunction with other security products and does not conflict with Apple's built-in firewall, which only blocks incoming connections. LuLu is a valuable addition to any macOS security setup, providing an additional layer of protection against malware and unauthorized network activity.