Similarity is a useful program that helps you to find and remove similar, duplicate musical files (MP3, WMA, OGG, ASF, WAV, FLAC, APE, WV) with the same or similar sound content, music tags (ID3,WMF,Vorbis). More info »
The only freeware which compares the audio itself to find duplicate audio files. It's not perfect and it can take a long time to scan a large collection, but for free it works great.
