From Jerome Couderc:
EasyTAG for Linux is simple and nice GTK+ interface makes tagging easier under Windows. EasyTAG provides utility for view and edit tags for MP3, MP2, MP4/AAC, FLAC, Ogg Vorbis, MusePack, Monkey's Audio, and WavPack files. EasyTAG can edit more tag fields like title, artist, album, disc album, year, track number, genre, comment, composer, original artist performer, copyright, URL, encoder name, and attached picture. EasyTAG gives Auto tagging like parse filename and directory to complete automatically the fields, Ability to rename files and directories from the tag or by loading a text file, Process selected files of the selected directory.