ThrottleStop - ThrottleStop is a lightweight application that was designed primarily for people who use their computers plugged into the wall and do not use the battery.
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.
3DP Net - 3DP Net is an online repository full of all the drivers for your PC components.
smcFanControl - [Download] smcFanControl 2.
PCSpeedUp - PCSpeedUp is a powerful CPU performance analyzer and performance booster software.
Argus Monitor - Argus Monitor is for monitoring and analyzing the temperature and the health status of the hardware parts of the system.