Idupe

iTunes has a “Show Duplicates” command, but it is of limited use.

18 Alternatives To Idupe

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Album Art Downloader

The Album Art Downloader is a program designed to make life easier for anyone who wishes to find…

Leawo Tunes Cleaner

Leawo Tunes Cleaner is a powerful iTunes cleanup tool, which can help you to delete duplicates in iTunes and get album artwork for iTunes music files.With it,you can clean up iTunes music library fast and comprehensively.
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MusicBrainz Picard

Official website for MusicBrainz Picard, a cross-platform music tagger written in Python.‎Downloads · ‎MusicBrainz Blog · ‎Picard 2.

Neat Music

Neat Music Cleans Up Your iTunes Automatically! Cleans up iTunes in One Click

PerfectTUNES

PerfectTUNES is an audio tagger containing the essential tools to keep your music library clean…
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Pollux

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Tune Sweeper

Show duplicates in your iTunes library. Automatically select which iTunes duplicates to keep based on your preferences. iTunes remove duplicates in one click.

WhoSampled

WhoSampled, the service that identifies music samples
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iTunes Duplicate Song Manager

iTunes Duplicate Song Manager with Folder Watch removes iTunes duplicates in Windows and Mac OS X.