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.

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.

Argus Monitor - Argus Monitor is for monitoring and analyzing the temperature and the health status of the hardware parts of the system.

AMD Ryzen Master - AMD Ryzen Master is a powerful and world’s first multi-threaded CPU overclocking software that supports the latest AMD AM4 socket Ryzen processors, helping you unleash your system’s true potential.

Open Hardware Monitor - Monitors temperature sensors, fan speeds, voltages, load and clock speeds, with optional graph.

GPU Monitor - GPU Monitor is a handy gadget for Windows 10 that is useful for monitoring the most recent stats of your NVIDIA or ATI Desktop Graphic Card: GPU temperature, GPU clocks, GPU usage, GPU fan speed, and more.