Islet

Most notch utilities just draw a static shape over the cutout. Islet actually behaves like iPhone's Dynamic Island: native spring-physics expand/collapse, real-time HUDs for volume and brightness, a live music glance with full playback controls, one-tap audio output switching (no System Settings detour), plus calendar, weather, and a file tray you can drop into from anywhere. Built natively in Swift + AppKit, not Electron, fast and fullscreen-aware.