MusicBrainz Picard Review
Music library tagger.
Ranked in these QuestionsQuestion Ranking
Doesn't cost a dime.
Works on Windows, Mac, and Linux
Pro Multiple ways of identifying tracks
Both Acoustic ID and already present metadata can be used to add in missing track info
Con Missing database entries
While community members can freely add metadata to their database, less well-known albums and artists may not have additions.