http://duplicateFilesDeleter.com
Improve computer performance by deleting duplicate files
Identical files not only waste your hard disk space, but also may
cause system slowdowns. By deleting duplicate files you can reduce
time needed to defragment your hard drives and minimize time used by
antivirus to scan your computer.
Sort and organize your media collections
Media files collections, such as music, video, images and photos,
often become the primary source of identical files. If you have a
music collection of several hundreds or even thousands mp3-files, you
may want to sort them by deleting identical tracks.
With Duplicate File Finder you can organize your media files and
increase free disk space needed to enlarge your collection.
http://duplicateFilesDeleter.com 
Windows (other)