What are some alternatives?
When comparing SpeedFan and HWMonitor, you can also consider the following products
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."
AIDA64 - AIDA64 is a system information, diagnostics and benchmarking solution for Windows PC.
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.
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.
Real Temp - Real Temp is a temperature monitoring program designed for all Intel single Core, Dual Core, Quad...