Mp3tag is a powerful and yet easy-to-use tool to edit Tags of MP3, Ogg Vorbis, Musepack, iTunes MP4, FLAC and WavPack files. It is a freeware MP3 tag editing application.
Here are some screenshots to illustrate the features and user interface of this application:
MusicBrainz Picard
MetatOGGer
TagScanner
taghycardia
MP3 Diags