WildRename is a multi-file renaming application with simple user interface helps you build and perform many file renaming operations one-by-one or in batches.
-convert filenames to lower/upper case or normalise case (Capitalize First Letter)
-add or remove strings of characters from filenames
-replace strings of characters in filenames, using either simple replacements or powerful regular expressions
-add text counters to a series of files (e.g. 0001_filename.ext)