Audacity - Audacity is a free and open-source audio production software suite that includes a surprising array of editing tools and recording systems.
GoldWave - GoldWave. Digital Audio Editing Software. Record • Restore • Convert • Analyze. Fully loaded to do everything from the simplest recording and editing to the most sophisticated audio processing, restoration, enhancements, analysis, and conversions.
Adobe Audition - Mix, edit, and create audio content in Adobe Audition CC with a comprehensive toolset that includes multitrack, waveform, and spectral display.
Logic Pro X - Music production.
GarageBand - GarageBand is a fully equipped music creation studio for Mac
Acoustica - Acoustica is an audio editing tool for editing, mastering and restoration work on both Mac and PC.