GitHub - till-f/MP3-Optimizer-for-Blue-Me: Small tool to fix any issues with playing MP3 files from USB on Blue&Me units (used in cars of Fiat, Alfa Romeo and Lancia). Includes a playlist editor.
Sound Normalizer - Gain FLAC Mp3 MP4 Wav ALAC AAC Ogg APE audio files
GitHub - way2enjoy2/fis-optimizer-way2enjoy: A optimizer for fis to compress JPG,PNG, GIF, PDF, MP3, MP4 by using way2enjoy.
FileOptimizer - Download
Free MP3 Quality Optimizer download for free - GetWinPCSoft