macmon
Real-time system monitor for Apple Silicon Macs (M1–M5)
...The tool provides a terminal user interface for viewing CPU, GPU, RAM, power, and temperature data as the system runs. It is useful for developers, performance testers, AI users, and Mac power users who want deeper visibility into hardware behavior. macmon can also expose metrics through JSON or Prometheus-compatible output, which makes it suitable for dashboards and automated monitoring. Its main value is giving Apple Silicon users a fast, native, and scriptable way to understand system performance.