Alternatives to iStatistica Core

System monitor for the menu bar

Status monitoring

Set of CPU, memory, disk, and network monitoring tools

System monitoring dashboard with historical analytics

System monitor with temperature & fans plugins

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

Htop on steroids

Notification Center widget and menu bar application to monitor fans

Monitors computer mic and webcam

Power management and monitoring for Apple Mx processors

System monitor

Menu bar app to monitor graphics card usage