Audacity - Audacity is a free and open-source audio production software suite that includes a surprising array of editing tools and recording systems.
TwistedWave - TwistedWave is one of the unique audio editors that allow you to edit your music file online without any installation.
Adobe Audition - Mix, edit, and create audio content in Adobe Audition CC with a comprehensive toolset that includes multitrack, waveform, and spectral display.
Radium - Radium is a music editor with a new type of interface.
GarageBand - GarageBand is a fully equipped music creation studio for Mac
Leapic Audio Editor - Leapic Audio Editor is a all-in-one audio editor, converter, recorder, player, splitter and joiner.