There are several open source software options available for audio editing. Some popular options include:
Audacity: Audacity is a free and open source audio editing software that is available for Windows, Mac, and Linux. It is a powerful tool that offers a wide range of features, including support for multiple tracks, effects and filters, and support for a variety of file formats.
LMMS: LMMS (Linux Multimedia Studio) is a free and open source audio editing software that is available for Windows, Mac, and Linux. It is designed for music production and offers a wide range of features, including support for virtual instruments, audio effects, and support for a variety of file formats.
Ardour: Ardour is a free and open source digital audio workstation (DAW) that is available for Linux. It is a powerful tool that offers a wide range of features, including support for multiple tracks, audio effects, and support for a variety of file formats.
Ocenaudio: Ocenaudio is a free and open source audio editor that is available for Windows, Mac, and Linux. It is designed to be easy to use and offers a wide range of features, including support for multiple tracks, effects and filters, and support for a variety of file formats.
REAPER: REAPER (Rapid Environment for Audio Production, Engineering, and Recording) is a digital audio workstation (DAW) that is available for Windows, Mac, and Linux. It is a powerful tool that offers a wide range of features, including support for multiple tracks, audio effects, and support for a variety of file formats.
No matter which open source audio editing software you choose, be sure to read through the documentation and get familiar with the interface and features before you start editing your audio files.