The only open source alternative I was able to find was CPU-X, an alternative to CPU-Z:
Another example is I recently got interested in purchasing second hand GPUs and most of the cards found online would have their vbios modded for crypto mining, and to restore to a default bios most people would use the ATIFlash / NVFlash utilities from TechPowerUp. I got interested in how such a utility would work for modern GPUs and to no avail, I could not find any open source tools that would demonstrate the capabilities of these tools