MusicBrainz Picard Is A Cross-Platform Audio Tagger

MusicBrainz Picard is an open-source and free tag editor for audio files. It is written in Python programming language licensed under GNU General Public License version 2+. It supports multiple popular formats such as mp3, FLAC, OGG, M4A, WMA and more. Picard uses AcoustID audio fingerprints, allowing files to be identified by the actual music, even if they have no metadata.
Picard can lookup entire music CDs with a click. Picard also supports plugins if you need a particular feature, you can choose from a selection of available plugins or write your own to extend functionality. Picard is not built to be a mass single-track tag fixer. Picard believes in quality over quantity and provides a plethora of customization to tweak music collections to your needs.