Audacity - Audacity is a free and open-source audio production software suite that includes a surprising array of editing tools and recording systems.
Cubase - Cubase is one of the world’s most powerful music creation software packages. From first idea to finished recording, Cubase helps you to make outstanding music.
Spek - Spek helps to analyse your audio files by showing their spectrogram.
SoX - Sound eXchange is a command line utility that can convert various formats of computer audio files...
FL Studio - Image-Line's FL Studio, now on it's 12th version, is a well-known music production suite and the most popular beat processor on the market, due no doubt to its longevity. Read more about FL Studio.
AudioMass - A full-featured web based audio editor 🎶