Edit the tags on a MP3 music file.
Tag is a command line tool that may be used to tag numerous audio files.
TagPy is can read and write ID3 tags.
MP3 Tag Viewer and MP3 Image Extractor. ( ID3v1, ID3v2 tags, MPEG Information)
Opaqua is a small application that lets you tag your audio files.
MP3 Tag Express specializes in mass-modifying the tags for audio files.