Speccy - Speccy - find the details of your computer's specs. Great for spotting issues or finding compatible upgrades. Download the latest version free.
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.
AIDA64 - AIDA64 is a system information, diagnostics and benchmarking solution for Windows PC.
GPU-Z - GPU-Z is a lightweight system utility designed to provide vital information about your video card...
Open Hardware Monitor - Monitors temperature sensors, fan speeds, voltages, load and clock speeds, with optional graph.
Belarc Advisor - Belarc's products automatically create an accurate and up-to-date central repository (CMDB), consisting of detailed software, hardware, network and security configurations.