Speccy - Speccy - find the details of your computer's specs. Great for spotting issues or finding compatible upgrades. Download the latest version free.
AIDA64 - AIDA64 is a system information, diagnostics and benchmarking solution for Windows PC.
Open Hardware Monitor - Monitors temperature sensors, fan speeds, voltages, load and clock speeds, with optional graph.
Neofetch - Fancier version of Screenfetch that displays colors and supports more platforms.
GPU-Z - GPU-Z is a lightweight system utility designed to provide vital information about your video card...
HWMonitor - HWMonitor is a hardware monitoring program that reads PC systems main health sensors : voltages, temperatures, fans speed.