mp3frip renames MP3 files. It features searching directories recursively, upper, lower or title case files, changing underscores to spaces and vice versa, ability to form file names from ID3v1(.1) tag (artist, song title, album, track number) if they exist and the existing file name, Test mode, Smart/Stoopid/Safer mode (won't overwrite existing files), and more.
Zina is a graphical interface to your MP3 collection, a personal jukebox, a Podcaster, and an MP3 streamer. It includes an optional Flash player, a tag editor, and can search the Web for album art and song lyrics. It can run alone, be embedded into an existing Web site, or be used as a module in Drupal, Joomla, and Wordpress.