Portero

Portero is a lightweight, open-source Mac application designed for developers, system administrators, and power users who need to monitor and manage network activity on their machines. By providing a detailed view of every open port and the associated processes, it helps users quickly identify what's running behind the scenes. Whether troubleshooting 'address already in use' errors or ensuring certain ports are blocked for security, Portero offers an intuitive interface for managing network connections directly from your Mac. Its ability to kill processes on busy ports and integrate with macOS firewall features makes it a versatile tool for maintaining system stability and security. As an open-source project, it appeals to those who prefer customizable, community-driven solutions that enhance native macOS capabilities.