PORTPEEK · OPEN SOURCE
PortPeek is a native macOS menu-bar app that shows every TCP port listening on your machine. It rescans with lsof every three seconds, labels each port by probing its HTTP title, colors it by process, and lets you open, copy, or kill whatever is squatting there, all without leaving the menu bar.
Build it yourself with ./scripts/build.sh && ./scripts/install.sh; PortPeek runs on macOS 13 and up and installs as a menu-bar-only app with no Dock icon.