Audacity - Audacity is a free and open-source audio production software suite that includes a surprising array of editing tools and recording systems.
Acoustica - Acoustica is an audio editing tool for editing, mastering and restoration work on both Mac and PC.
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.
iZotope RX6 - iZotope RX6 is a noise reduction and audio repair software.
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.
AVS Audio Editor - AVS Audio Editor enables user to apply various effects and filters like cut, join, trim, mix, delete parts, split audio files.