nmon - This systems administrator, tuner, benchmark tool gives you a huge amount of important performance...

Process Tamer - Freeware Microsoft Windows utility that monitors the CPU use of applications, alerts when they use too much, and reduces their priority to keep your PC fast.

gtop - System monitoring dashboard for terminal

Big Meter Pro - Big Meter Pro is a utility that monitors the disk and memory of your CPU.

psutil - psutil is a module providing an interface for retrieving information on all running processes and...

SysGauge - SysGuage is a responsive software utility that monitors the memory status, CPU usage, as well as network and disk activities of your system.