PortKiller

PortKiller answers the familiar "address already in use" problem without a trip to lsof. It finds every listening TCP port, shows which process owns it, and stops that process gracefully or forcefully with a click. Ports can be searched, grouped by kind, starred as favorites, or added to a watch list that sends notifications.

It also starts and supervises kubectl port-forward sessions, reconnecting them when they drop, and shows active Cloudflare Tunnel connections. On the Mac it runs from the menu bar; a Windows version is also available. Downloads are on GitHub releases and in Homebrew.