TwistedWave - TwistedWave is one of the unique audio editors that allow you to edit your music file online without any installation.
WaveShop - Open source audio editor
Radium - Radium is a music editor with a new type of interface.
Audacity - Audacity is a free and open-source audio production software suite that includes a surprising array of editing tools and recording systems.
SoundEngine - Freeware audio editor/recorder
WaveMax Sound Editor - WaveMax Sound Editor is an ideal solution for audio editing and mastering.