EasyTAG is an utility for viewing and editing tags for MP3, MP2, FLAC, Ogg
Vorbis, MusePack and Monkey's Audio files. 

Features:

- Auto tagging: parse filename and directory to complete automatically the
  fields (using masks),
- Ability to rename files from the tag (using masks) or by loading a text
  file,
- Process selected files of the selected directory, 
- Ability to browse subdirectories, 
- Recursion for tagging, removing, renaming, saving..., 
- Can set a field (artist, title,...) to all other files, 
- Read file header informations (bitrate, time, ...) and display them, 
- Auto completion of the date if a partial is entered, 
- Undo and redo last changes, 
- Ability to process fields of tag and file name (convert letters into
  uppercase, downcase, ...),
- CDDB support (from http protocol), 
- A playlist generator window, 
- French, German, Russian, Dutch, Hungarian, Swedish, Italian, Japanese,
  Ukrainian, Czech, Spanish, Polish and Romanian translations

WWW: http://easytag.sourceforge.net