cmux

cmux is a native macOS terminal (Swift + AppKit, GPU-accelerated via libghostty) purpose-built for running many AI coding agents in parallel. Vertical workspace tabs surface git branch, PR status, ports, and per-agent notifications, and agent-spawned subagents become visible native panes and splits rather than hidden background processes. It includes an embedded scriptable browser, a CLI/socket API for automation, and notification hooks that integrate with Claude Code and other agents. Made by Manaflow, it passed 22k GitHub stars within months of launch.