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Métamorphose 1.1.1
Métamorphose File -n- Folder Renamer is a free, open source mass renaming program that combines great flexibility with an intuitive interface.
Metamorphose allows many command line renaming operations in a single utility, perfect for those of us that need to rename large numbers of files and/or folders on a regular basis.
However, the ease of the interface ensures a one-time user (I need to rename 5 gigs of mp3’s) will not find it too frustrating to use.
Cross platform for your pleasure, it can run on a variety of operating systems.
Download: Métamorphose 1.1.1 | Métamorphose 2 0.4.3 Beta Windows 2000/XP/2003/Vista, Linux