SongKong!

Mp3tag is a powerful and yet easy-to-use tool to edit metadata of common audio formats where it supports ID3v1, ID3v2.3, ID3v2.4, iTunes MP4, WMA, Vorbis Comments and APE Tags.

Picard is the next generation MusicBrainz tagging application. This new tagging concept is album oriented, as opposed to track/file oriented like the ClassicTagger was. Picard is written in Python, which is a cross-platform language, and makes use of cross-platform libraries - this allows the same code to run both on Windows, Linux and Mac OS X.

TagScanner is a multifunction program for organizing and managing your music collection. It can edit tags of mostly state-of-the-art audio formats, rename files based on the tag information, generate tag information from filenames, and perform any transformations of the text from tags and filenames.

EasyTAG is a utility for viewing and editing tags.

Tag&Rename is a music files tag editor that easily handles all popular digital audio formats. No matter what music compressor you prefer, you can keep your music collection organized with Tag&Rename. It is the only tag editor and organizer which has full native support for: mp3 (ID3v1, ID3v2.2, ID3v2.3 and ID3v2.4 tags), MusePack mpc/mp+ (APEv1, APEv2 and ID3v1 tags), Windows Media wma, asf and wmv files, Ogg Vorbis/Flac/Speex (vorbis comments), Apple iTunes and iPod aac (m4a) files including mp4, lossless m4a and protected m4p files, most popular lossless codecs including Monkeys Audio, Flac, Wav Pack, Optim Frog, True Audio, Apple, Windows Media lossless and Wav. »

Jaikoz is a tagger that specializes in mass tagging of music file tags. Jaikoz performs acoustic fingerprint matching and metadata lookups automatically using the MusicBrainz, Discogs and Acoustid databases. It can also look up artwork and find duplicates songs.

The Album Art Downloader is a program designed to make life easier for anyone who wishes to find and update their album art for their music collection. The sources for the pictures can be defined by creating plugin scripts.

Tagger is application that auto tags audio files. It also supports batch tag editing.

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Metadatics is a powerful and advanced audio metadata editor. It supports batch editing of most common audio file types including MP3, M4A, AIFF, WAV, FLAC, APE, OGG, WMA, and more. Lookup metadata from online sources, rename files based on metadata, or manipulate metadata using one of the many built in functions. Metadatics provides all you need to edit metadata with ease and flexibility.

Album Cover Art Downloader is a program that will semi-automatically download album cover images for your music collection. All you have to do is point it at the root of your music directory and for each directory, the program will download a set of corresponding (well, best guess) album covers from the Internet, from which you can choose one that suits your fancy.