Free Mp3 Format DLL   
http://www.research-lab.com

ActiveX to convert Mp3 To Wav, Wav To Mp3 & Wav To Wav with plenty of effects and formats. Allows setting output mp3 Frequency, bit width, compression, operation mode and frequency filters. Wave Settings allow channel selection, amplification and more than 30 output audio formats. Sound Exchange allows compressions like GSM, uLaw, alaw and also allows audio effects like echo, reverse, cut, fader and swap. All this right on your right click

Dexster   
http://www.snosh.net

Dexster is a perfect audio editor tool for your music production that supports many popular audio formats and features audio cd burning. Dexster provides cool and easy-to-use interface that allow you to edit an audio file visually (Cut, Copy, Delete Select, Delete Silence, Paste, Paste From File, Mix, Mix From File); apply different effects (Amplify, Compressor, Delay, Envelope, Equalizer, Expander, Fade, Flanger, Invert, Normalize, Phaser, Reverb, Reverse, Silence, Stretch, Trim, Vibrato, Chorus, Pitch Shift); Vocal Reduction; Mix Stereo Channels; Insert noise and silence in an audio file; Insert and change described information about a marker; Apply different filters to the selected part of an audio file (Band Pass Filter, FFT Filter, High Pass Filter, High Shelf Filter, Low Pass Filter, Low Shelf Filter, Notch Filter, Peak EQ Filter, Finite Impulse Response Filter); Record an audio file from a microphone or from other input device; Play an audio file or any part of it; Convert an audio file from one format to another; Extract audio from video files; Merge Audio Files; Extract audio from audio cd. Dexster supports audio format of uncompressed WAV PCM,compressed WAV (ADPCM, GSM, DSP and others),MP2 (MPEG 1/2 Layer-2),MP3 (MPEG 1/2 Layer-3),VOX (Dialogic ADPCM),WMA (Windows Media Audio 9),RAW audio (PCM, A-LAW, U-LAW),MPC (MusicPack),AVI (audio track), Audio CD, Ogg Vorbis (Version 1.0),G.721, G.723, G.726,AIFF (Apple audio format) and AU (UNIX audio format). Dexster also support audio cd burning for your music production.

Sound InDepth   
http://www.soundindepth.com

Sound In Depth is a powerful and easy-to-use audio editing and Converting program with multi-language support. Edit your sounds using cut, copy, and paste features (with unlimited undo functionality), mix tracks, or apply effects to your recordings. Built-in amplitude-envelope editor, a customizable spectrogram mode, & a frequency-analysis window for audio-analysis applications, batch open/edit many audio files at the same time such as:MP3,MP2,WAV,WMA,OGG,VOX,G726,RAW, DSS,CDA,MPC, PCM,GSM and more. Save audio files to the following formats: MP3, WAV, VOX, OGG, G726, WMA, and RAW, Also Features the ability to edit ID3 Tags of the following file types: WAV, MP3, WMA, and OGG. Record from all available audio sources in your system like microphone, stereo mix, line in and more. The Ability to Mix audio files or insert/append recorded audio into the current file and save the output. Also offers various editing features and a wide range of filters and effects and much more.

All Sound Editor XP   
http://www.wmasoft.com

All Sound Editor is a visual audio files editor. It can be used to build applications, that allow the end-user to perform various operations with audio data such as displaying a waveform image of an audio file, filtering, applying various audio effects, examining the frequency components and other details about your audio with the help of Frequency Analysis, Statistics, and Spectral View features, format conversion, etc.

McFunSoft Audio Editor   
http://www.mcfunsoft.com

McFunSoft® Audio Editor™ integrates all of the most-used audio editing technologies and post-production facilities into one editor. It’s the only authoring editor that gives you fast and efficient access to every aspect of audio editing, to record audio and apply different effects to track. Every most-used audio formats are defined, including: WAV, PCM, MP3, WMA, OGG and others. Advanced visual data analysis options such as Frequency Analysis, Waveform, Spectral View are at your disposal. A bunch of effects and filters will satisfy a most refined musicians taste. Create Audios: Create, import, convert and export audio files in different formats, including WAV, MP3, MP2, WMA, Ogg Vorbis, AIFF, MPC and etc. Apply Effects and Filters to Audio: All effects and filters you may need in audio editing are provided. Edit You Audio: Edit audio the way you want it – Edit like a pro with advanced effect and filter, which covers all industrial audio editing option. Record Audio: Record audio from micro phone, CD, video, and any audio you can hear from your computer. Adjust Your Audios: Choose from different encoding bit rates. Whether quality or file size is your preference, it offers adjustment in bit rate, frequency and the other parameters. Edit Audio Information: Display and edit of audio informations such as album, artist, year of publication and over a dozen others may show in all media player.