PortKiller is a cross-platform desktop application for developers that locates listening TCP ports and displays the linked processes. It allows searching by port or process name, pinning favorite items, monitoring specific ports with notifications, and terminating processes through graceful stop or forceful kill. Additionally, it manages kubectl port-forward sessions with status, logs, auto-reconnection, and notifications, and integrates visibility into active Cloudflare tunnels. It includes native applications for the macOS menu bar and the Windows system tray.