Idupe!

CopyTrans TuneTastic does a full iTunes cleanup: delete iTunes duplicate songs, get missing album artworks, fix iTunes missing songs, find orphan songs and import them in iTunes

Dupe Eliminator for iTunes is an intuitive tool to Clean iTunes from unwanted duplicates and missing tracks. Easy to use yet full-featured Windows Maintenance and Cleaning solution to clean iTunes. Reclaim space for your iTunes Music Library!

Neat Music Cleans Up Your iTunes Automatically!

Automatically fix tag problems in your MP3 library to make sure the albums don't duplicate, fragment or get lost on an iPhone/iPod touch or other tag-sorting portable players. Download and embed cover art for your MP3 folders in an automatic mode or quiclky remove embedded images from tags to save space. Recursively generate Unicode (.m3u8) playlists. On devices like iPhone and iPod, mp3 albums uploaded from PC often tend to duplicate, separate or lose original track order due to incorrect or missing id3 tags; taghycardia takes care of keeping the albums in one piece. It "knows" internally most of the causes leading to duplicate albums on iPhone, and either warns the user of errors or repairs them itself whenever possible. In addition, the program can be used as an efficient auto cover art fixer: it uses both local and online cover art images to tag mp3 files that lack embedded pictures. »

Pollux automatically cleans up music tag information such as name, artist, album, album art, genre, year, and lyrics. Analyzes the tracks unique fingerprint, so it can never be wrong. No existing track information necessary.

iTunes Duplicate Song Manager with Folder Watch removes iTunes duplicates in Windows and Mac OS X. iTunesDSM can also watch a folder and automatically add new files to iTunes safely.

Seamless compatibilityiTunify assures a seamless integration with iTunes and takes full advantage of the latest updates of iTunes. Simple but powerfuliTunify has all the basic stuff you might need for managing your iTunes library. But iTunify lets you run very complex actions using RegEx just as well. Time savingiTunify helps you save a lot of time by automating common workflows for you. Additionaly iTunify lets you save often used terms as templates. Realtime feedbackAll actions run in iTunify take effect directly in iTunes. So there is no need to update iTunes library every time. Powerful technologiesiTunify takes advantage of technologies such as Spotlight and RegEx which makes it a very powerful assistant for iTunes. »

Wondershare TidyMyMusic helps you fix the mislabeled songs, find album arts and embed the tag information to the MP3 files.