Hardware

Core Temp

http://www.alcpu.com/CoreTemp/

Monitors the temperature of the CPU cores. Simple and lightweight

CPU-Z

http://www.cpuid.com/softwares/cpu-z.html

Displays detailed technical information on CPU, motherboard, memory and version of Windows and DirectX.

GPU-Z

http://www.techpowerup.com/gpuz/

Displays detailed technical information on the video card (GPU).

Speccy

http://www.piriform.com/speccy

Analyse the system and displays detailed information on the hardware.