Audacity - Audacity is a free and open-source audio production software suite that includes a surprising array of editing tools and recording systems.
Free MP3 Cutter - Free MP3 Cutter helps you slice off any unnecessary parts of an MP3 track you don't want.
GarageBand - GarageBand is a fully equipped music creation studio for Mac
MP3 Splitter & Joiner - MP3 Splitter & Joiner is a MP3 audio editor.
Adobe Audition - Mix, edit, and create audio content in Adobe Audition CC with a comprehensive toolset that includes multitrack, waveform, and spectral display.
MP3 Trimmer - With MP3 Trimmer - the most easy to use MP3 editor for Macintosh - you can edit MP3 files, join MP3...