Gnoosic - Even if you don't know what you are looking for - gnod will find it.
MusicBrainz Picard - Official website for MusicBrainz Picard, a cross-platform music tagger written in Python.Downloads · MusicBrainz Blog · Picard 2.
BandNext - Discover bands that sound similar to artists you already love with BandNext. A single click saves your results to a Youtube playlist.
Mp3tag - Mp3tag is a powerful and easy-to-use tool to edit metadata of audio files. DownloadDownload Mp3tag, a powerful and easy-to-use tool to edit .
Musicroamer - A visual Pandora for discovering new music
Tag&Rename - Tag & Rename is a music files tag editor that conveniently controls all famous audio formats.