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Open Hardware Monitor - Monitors temperature sensors, fan speeds, voltages, load and clock speeds, with optional graph.
SpeedFan - Hardware monitor for Windows that can access digital temperature sensors located on several 2-wire SMBus Serial Bus. Can access voltages and fan speeds and control fan speeds. Includes technical articles and docs.
Geforce Experience - GeForce Experience is a new application from NVIDIA that optimizes your PC in two key ways.
smcFanControl - [Download] smcFanControl 2.
Guru3D - Guru of 3D: PC Hardware Reviews and tests
Argus Monitor - Argus Monitor is for monitoring and analyzing the temperature and the health status of the hardware parts of the system.