Metamorphose File -n- Folder Renamer for Windows

Mtamorphose File -n- Folder Renamer is an open source mass renaming program that combines great flexibility with an intuitive interface. Allows most 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 five gigs of mp3's) will not find it frustrating to use.