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.
AppPolice - Mac OS X app for quickly limiting CPU usage of any running process
Big Meter Pro - Big Meter Pro is a utility that monitors the disk and memory of your CPU.
CS Fire Monitor - CS Fire Monitor is a user-friendly system monitoring application that keeps a keen eye on your computer’s behavior and aspects related to the hardware of your system.
AMD64 CPU Assistant - AMD64 CPU Assistant
SysGauge - SysGuage is a responsive software utility that monitors the memory status, CPU usage, as well as network and disk activities of your system.