Audacity - Audacity is a free and open-source audio production software suite that includes a surprising array of editing tools and recording systems.
GarageBand - GarageBand is a fully equipped music creation studio for Mac
Tenacity - Tenacity is an easy-to-use, privacy-friendly, FLOSS, cross-platform multi-track audio editor/recorder for Windows, macOS, Linux and other operating systems.
Adobe Audition - Mix, edit, and create audio content in Adobe Audition CC with a comprehensive toolset that includes multitrack, waveform, and spectral display.
AudioMass - A full-featured web based audio editor 🎶
Reaper - Reaper is a focused digital audio workstation (DAW) developed by Cockos. In the creation of the software, the digital audio technology company intended to make audio editing accessible to the masses.