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

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

Tune Sweeper - Show duplicates in your Music library. Automatically select which duplicates to keep and delete based on your preferences. Remove duplicates with one-click from your iTunes or Music app library.

Album Cover Art Downloader - If your music library is missing cover artwork, then you need a free album art downloader to automatically seek and download album cover artwork.

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.

Cover Fetcher - Cover Fetcher is a simple program that downloads album artwork from last.fm.