Clone Fighter frees up disk space by finding and deleting duplicate files and folders, giving you a chance to recover gigabytes of your disk space. This scan can reveal just how many copies of the same document, photo or other type of file you have saved, scattered through your disk. All duplicate files are checked byte-by-byte to give you 100% guarantee they are exact copies.
iCollections 
iScherlokk 
Viper FTP 