MP3Gain - A free automatic mp3 volume normalizer.
QMP3Gain - Graphical user interface front end supporting MP3Gain engine which analyzes and losslessly adjusts...
wxMP3gain - Needs to be compiled.
easyMP3Gain - Graphical User Interface (GUI) for MP3Gain, VorbisGain and AACGain (enables you to modify the...
MP3 Normalizer - Improve the quality of MP3 collections by adjusting volume and applying audio effects.
Normalize - Normalize is a command line utility used to normalize the audio levels of audio files.