MP3Gain is free and open source cross-platform audio normalizer software, which analyzes and losslessly adjusts mp3 files to a specified target volume. It does not simply do peak amplitude normalization. Instead, it performs statistical analysis to determine how loud the file actually sounds to the human ear.
IDs: Analyzer, Audio/Video, C++, LGPL, Mixer, MP3Gain, MP3Gain 1.5.2, Visual Basic