SOUND EDITING TOOLS

Audacity is an open source audio editor that is available for several platforms (including Windows, Mac, and Linux/Unix). It is one of the most popular free audio editors in use today mainly due to its excellent set of tools. 
Download Audacity here.


Kristal Audio Engine is a powerful multi-track recorder, audio sequencer and mixer - ideal for anyone who  wants to get started with recording, mixing and mastering digital audio. 
Download Kristal here.

Wavosaur doesn’t need to be installed and can run on Windows 98, XP, and Vista. It has a good set of tools for editing digital audio files.
Download Wavosaur here.

Wavepad Sound Editor is a feature-rich program that supports a good selection of file formats; including mp3, wma, wav, flac, ogg, real audio.
Download Wavepad here.

Power Sound Editor is a visual audio editing and recording software solution, which supports many advanced and powerful operations with audio data.
Download Powersound here.