TwistedWave - TwistedWave is one of the unique audio editors that allow you to edit your music file online without any installation.
Audacity - Audacity is a free and open-source audio production software suite that includes a surprising array of editing tools and recording systems.
SunVox - SunVox is a small, fast and powerful modular synthesizer with pattern based sequencer (tracker).
Leapic Audio Editor - Leapic Audio Editor is a all-in-one audio editor, converter, recorder, player, splitter and joiner.
Adobe Audition - Mix, edit, and create audio content in Adobe Audition CC with a comprehensive toolset that includes multitrack, waveform, and spectral display.
SoundEngine - Freeware audio editor/recorder