Audacity - Audacity is a free and open-source audio production software suite that includes a surprising array of editing tools and recording systems.

Lossless Audio Checker - A utility to check whether an audio file is truly lossless or not.

Spek - Spek helps to analyse your audio files by showing their spectrogram.

Spectro - Spectro is a freeware audio file analyzer for windows.

SoX - Sound eXchange is a command line utility that can convert various formats of computer audio files...

AudioMass - A full-featured web based audio editor 🎶