Batch File Rename 

Batch File Rename is a powerful and flexible file renamer designed for digital camera owners, web masters, music and image collectors, and so on. It provides an easy way to simplify renaming multiple files and folders.
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Picnam 

Picnam makes it easy to give your digital photos and other images meaningful names. Renaming is as simple as typing the new name and hitting enter. No right clicking or navigating through menus is required.
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