A LiveUSB that has memory checking, storage checking, gpu checking along with stress testing of these would be amazing.
Building a new PC? Slap in the liveUSB, check all the components then stress test soak it to confirm its all good

HWInfo all the way. OCCT is good but proprietary.

I haven’t tried it yet, but I expect it will be nice to be able to compare our own hardware performance to the benchmarks we see in reviews, and do apples-to-apples comparisons with the results reported by Windows users when performance tuning.