DarkAudacity - DarkAudacity is a build/fork of Audacity with quote "a darker more modern theme - and a few small tweaks."
Audacity - Audacity is a free and open-source audio production software suite that includes a surprising array of editing tools and recording systems.
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.
GarageBand - GarageBand is a fully equipped music creation studio for Mac
Amazing Slow Downer - !A slow down music software for Mac and Windows computers - Amazing Slow Downer
AudioScrub - Slow down music, change the key, and loop