Open Hardware Monitor is described as 'The Open Hardware Monitor is a free open source software that monitors temperature sensors, fan speeds, voltages, load and clock speeds of a computer' and is a very popular system information utility in the system & hardware category. There are more than 50 alternatives to Open Hardware Monitor for a variety of platforms, including Windows, Linux, Mac, Flathub and Flatpak apps. The best Open Hardware Monitor alternative is HWiNFO (32/64). It's not free, so if you're looking for a free alternative, you could try HWiNFO (32/64) or Libre Hardware Monitor. Other great apps like Open Hardware Monitor are GPU Screen Recorder, Sidebar Diagnostics, Stats and HWMonitor.
Libre Hardware Monitor is a fork of discontinued Open Hardware Monitor, and practically just like its predecessor, with updates for recognizing today's hardware. I built a new PC and tried several alternatives which left me unsatisfied, until I found Libre which worked exactly like Open Hardware Monitor in my soon-to-retire 6 years old PC. Problem solved!