WaveShop - Open source audio editor
Lossless Audio Checker - A utility to check whether an audio file is truly lossless or not.
TwistedWave - TwistedWave is one of the unique audio editors that allow you to edit your music file online without any installation.
Spectro - Spectro is a freeware audio file analyzer for windows.
Audacity - Audacity is a free and open-source audio production software suite that includes a surprising array of editing tools and recording systems.
Spek - Spek helps to analyse your audio files by showing their spectrogram.