ChordU - Extracts chords from any song, integrated YouTube.
Sonic Visualiser - Sonic Visualiser is a program for viewing and analysing the contents of music audio files.
yalp.io - Automatic chords extraction from mp3 and YouTube
BRP-PACU - BRP-PACU is a remarkable platform that works as a dual-channel FFT audio analysis tool.
Guitaa.com - Turn ANY song into chords, play along with interactive chords and diagram, transpose, loop, tempo control.
WavePad FFT Sound Analyzer - WavePad FFT is a best-in-class platform that comes with the exclusive service of sound analysis with more accuracy and details.