EasyTAG is an utility for viewing, editing and writing tags of your 
MP3, MP2, FLAC and OGG files. Its simple and nice GTK+ interface makes 
tagging easier.

Features (version 0.22) :

  - View, edit, write tags of MP3, MP2, FLAC files (supporting ID3v2.3 
and ID3v1.x specifications) and OGG files,
  - 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 
txt file,
  - Process all 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 last changes,
  - Ability to process fields of tag and file name (convert letters into 
uppercase, downcase, ...),
  - A tree based browser,
  - A list to select files,
  - Simple and explicit interface!,
  - Menu bar and shortcuts,
  - A playlist generator window,
  - A file searching window,
  - French, German, Russian, Dutch, Hungarian, Swedish, Italian, 
Japanese, Ukrainian, Czech and Spanish translation languages,
  - Written in C and uses GTK+ 1.2 for the GUI.

WWW: http://easytag.sourceforge.net