LuLu by Objective-See

What is LuLu by Objective-See?

LuLu is a free, shared-source firewall for macOS that aims to block unknown outgoing connections unless explicitly approved by the user. Its primary function is to detect and prevent unauthorized network activity, which can help identify and mitigate potential malware infections. LuLu can also be used to control the network access of legitimate applications, restricting their ability to transmit data to remote servers without user consent

Highlights

• Blocks unknown outgoing network connections until approved by the user
• Designed to detect and mitigate malware by flagging unauthorized networking activity
• Can be used to control the network access of OS components and 3rd-party applications
• 100 free with no ads, trials, or missing features
• Shared-source code available on GitHub, allowing for transparency and auditing
• Provides simple, easy-to-use functionality with a small attack surface
• Offers enterprise-friendly features, such as mechanisms to subscribe to network events and access rule data