Mp3Doctor

Mp3Doctor offers audio software capable of encoding, decoding, resample, normalize, fix, trim, equalize, modify the tempo (without modify pitch) modify pitch without changing the tempo. Since 2001 Mp3Doctor ahs being sold in CNET.

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SuperMp3Normalizer
Trial version
Normalize the volume level of your MP3 files.
Windows
Mp3Doctor Pro
Trial version
Optimize your MP3 files with trim, normalize, and equalize features.
Windows
MP3Doctor
Trial version
Check, modify, and improve the quality of your MP3 files.
Windows