Alternatives to MenuMeters for El Capitan (and later)

System monitor for the menu bar

Menu bar application that displays the CPU speed limit due to thermal issues

Status monitoring

System monitor

System monitor with temperature & fans plugins

Power management and monitoring for Apple Mx processors

Monitors computer mic and webcam

System monitoring dashboard with historical analytics

System monitoring for Apple Silicon

System monitoring app

Check important metrics from the menubar

Provides information about device hardware and software