Core Temp is free and easy to use CPU temperature monitoring software. Displays core temperature in easy to understandable manner. Great tool helps us to keep an eye on your CPU Temperature to avoid Hardware failure.
Open Hardware Monitor - Monitors temperature sensors, fan speeds, voltages, load and clock speeds, with optional graph.
iStat Menus - "An advanced Mac system monitor for your menubar."
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.
iStatistica Pro - System monitor. Reinvented. 💻 🖥
CPU-Z - CPU-Z is a freeware that gathers information on some of the main devices of your system : Processor name and number, codename, process, package, cache levels.
Stats - Simple macOS system monitor in your menu bar.