Spetralissime is a standalone Spectrum Analyzer application based on high precision band pass filter bank, more adapted to the human audition. Spectralissime gives a more consistent spectrum analysis and allows better understanding of any audio phenomena thanks to its constant precision, from 20 Hz to 20 kHz.

www.vb-audio.com/Spectralissime
voicemeeter.com/vb-audio-spectralissime-professional-high-definition-multiband-audio-analyzer

Resources:

en.wikipedia.org/wiki/Spectrum_analyzer