Acon AS - Acoustica, an audio editor for Windows 9x/NT.
Acoustic Labs Audio Mixer - Provides multitrack recording, editing and mixing on the PC. Demo available.
Audacity Audio Editor - Free, fully-functional multi-track audio editor for Windows (98 and later), Macintosh (MacOS and OSX), and Linux.
AudioLabs - Mixing and editing tools for PowerPC and also Windows PC platforms.
Barrcode - BCX and BRIAN editing and playout software for radio stations.
Celemony Software - Makers of Melodyne, a program that lets you edit audio soundwaves in a piano-roll interface.
Fx Audio Editor - Visually play, record, edit or convert most sound file formats. Add special effects and apply filters.
Glowing Coast Technology - Audio Suite, a multi-track workstation consisting of tightly integrated groups of audio waveform editing tools.
GoldWave - Multiple Document Interface for editing dozens of waves in one session. Realtime oscilloscopes.
LDB Loop Creation - Create Stomper and WAV drum loops, adding various effects. Shareware.
LeafFX - Digital effects software for musicians. Can work "live" on microphone input, or on prerecorded WAV files.
Maven 3D - Positional 3D audio effects and crosstalk cancellation. Edit in stereo up to 5.1 channels.
MAYAH EditPro - Recording, editing, and transmission package for MP3 files.
MixViews - A Unix audio editor designed to process digital sound and other forms of on-disk data.
NGWave - [Win] Sound editing application, record, process, and save sound or music files. Product specifications, screenshots, tutorial, FAQs, and downloads.
RockN Wav - WAV file editor that offers many effects and functions. Freeware.