Sounds Logical
WaveWarp editor for the PC platform. Audio signal processing and effects.
http://www.soundslogical.com/

Celemony Software
Makers of Melodyne, a program that lets you edit audio soundwaves in a piano-roll interface.
http://www.celemony.com/

Glowing Coast Technology
Audio Suite, a multi-track workstation consisting of tightly integrated groups of audio waveform editing tools.
http://www.glowingcoast.co.uk/index.htm

LDB Loop Creation
Create Stomper and WAV drum loops, adding various effects. Shareware.
http://www.lysator.liu.se/~zap/ldb/

Audacity Audio Editor
Free, fully-functional multi-track audio editor for Windows (98 and later), Macintosh (MacOS and OSX), and Linux.
http://audacity.sourceforge.net

SAWStudio by RML Labs
Mixing and editing. Demos, free online training.
http://www.sawstudio.com/

AudioLabs
Mixing and editing tools for PowerPC and also Windows PC platforms.
http://www.audiolabs.it

Fx Audio Editor
Visually play, record, edit or convert most sound file formats. Add special effects and apply filters.
http://fxaudioeditor.com/

Maven 3D
Positional 3D audio effects and crosstalk cancellation. Edit in stereo up to 5.1 channels.
http://www.maven3d.com/en/index.asp

Acoustic Labs Audio Mixer
Provides multitrack recording, editing and mixing on the PC. Demo available.
http://www.acoustic-labs.com

RockN Wav
WAV file editor that offers many effects and functions. Freeware.
http://www.rocknaudio.com/

HairerSoft: Amadeus II
[Mac] Main features, screenshots, download and support area.
http://www.hairersoft.com/Amadeus.html

Wave Flow
Includes over 60 sound editing functions, effects, tools, and filters.
http://www.waveflow.com

Acon Digital Media
Develops Acoustica, an audio editor for Windows. Main features, screenshots, purchase information.
http://www.acondigital.com/

MP3 Remix
Windows tool to create DJ style remixes of MP3 or CD tracks automatically by detecting beat and song dynamics. Demo available.
http://www.fxsound.com

Audio Editor Pro
Windows audio editor that allows basic editing operations with audio files and format conversion. Demo available.
http://www.audioeditorpro.com/

Barrcode
BCX and BRIAN editing and playout software for radio stations.
http://www.barrcode.alivewww.co.uk/

AudioEdit Deluxe
Windows audio editor and batch converter software solution for MP3, WMA, WAV, CD, OGG, etc. Free trial version available.
http://www.mystikmedia.com/audioedit.asp

Transposer
Text editor for musicians and amateurs. Extracts chords and texts from karaoke and MIDI files, performs transpositions of key.
http://www.mymusicsoft.com/

AudioMasters Forum
A Syntrillium Cool Edit Pro/Adobe Audition community. Discuss recording and search the original Syntrillium archives.
http://www.audiomastersforum.net