SysGauge - SysGuage is a responsive software utility that monitors the memory status, CPU usage, as well as network and disk activities of your system.
CPU-Z - CPU-Z is a freeware that gathers information on some of the main devices of your system : Processor name and number, codename, process, package, cache levels.
Big Meter Pro - Big Meter Pro is a utility that monitors the disk and memory of your CPU.
Speccy - Speccy - find the details of your computer's specs. Great for spotting issues or finding compatible upgrades. Download the latest version free.
Process Lasso - Process Lasso is NOT yet another task manager.
AIDA64 - AIDA64 is a system information, diagnostics and benchmarking solution for Windows PC.