Open Hardware Monitor - Monitors temperature sensors, fan speeds, voltages, load and clock speeds, with optional graph.
NZXT CAM - CAM is a piece of software that was designed by NZXT, one of the industry leaders in the world of gaming PC production.
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.
Moo0 System Monitor - Lets you keep your eye on system resource usages of your PC.
Core Temp - Nov 4, 2017 - Core Temp is a compact, no fuss, small footprint, yet powerful program to monitor processor temperature and other vital information.
ASUS AI Suite - ASUS AI Suite is designed for the products of ASUS for monitoring the performance of entire PC.