cmux is a Ghostty-based macOS terminal emulator with vertical and horizontal tabs, notification rings, and a notification panel for AI coding agents.
It includes an in-app browser with scriptable API, sidebar displaying git branch, PR status, working directory, ports, and notifications, plus CLI and socket API for automation. Installation options are DMG download or Homebrew cask, with native Swift/AppKit build for fast performance and Ghostty config compatibility.