IDFree ~ Simple Windows Tag Editor

IDFree is a simple MP3 ID3 tag editor for Windows. It uses the excellent Open Source id3lib library to read and write these ID3 tags.

idfree

Website

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AlbumArtDownloaderXUI ~ Obtain Album Artwork

AlbumArtDownloader XUI – You know you want it…

This project is a rewrite of the Album Art Downloader code, using .NET Framework 3.5.

albumartdownloader

HydrogenAudio Topic
SourceForge

Kid3 ~ Cross-platform Audio Tagger

If you want to easily tag multiple MP3, Ogg/Vorbis, FLAC, MPC, MP4/AAC, MP2, Opus, Speex, TrueAudio, WavPack, WMA, WAV and AIFF files (e.g. full albums) without typing the same information again and again and have control over both ID3v1 and ID3v2 tags, then Kid3 is the program you are looking for.

kid3

Website
SourceForge
Wikipedia

KeyFinder ~ Musical Key Song Analyser

KeyFinder is an open source key detection tool, for DJs interested in harmonic and tonal mixing. It’s intended to be very focused: no library management, no track suggestions, no media player. Just a fast, efficient workflow tool. It supports a huge range of codecs thanks to LibAV, and writes to metadata tags using TagLib.

keyfinder

Mac / Windows

Website

AcoustID ~ Identify Your Music

AcoustID is a project providing complete audio identification service, based entirely on open source software.

It that consists of a client library for generating compact fingerprints from audio files, a large crowd-sourced database of audio fingerprints, many of which are linked to the MusicBrainz metadata database using their unique identifiers, and an web service that enables applications to quickly search in the fingerprint database.

Website
Applications
Acoustic Fingerprint – Wikipedia

beets ~ The Music Geek’s Media Organizer

The purpose of beets is to get your music collection right once and for all. It catalogs your collection, automatically improving its metadata as it goes using the MusicBrainz database. Then it provides a bouquet of tools for manipulating and accessing your music.

Because beets is designed as a library, it can do almost anything you can imagine for your music collection. Via plugins, beets becomes a panacea:

  • Fetch or calculate all the metadata you could possibly need: album art, lyrics, genres, tempos, ReplayGain levels, or acoustic fingerprints.
  • Get metadata from MusicBrainz, Discogs or Beatport. Or guess metadata using songs’ filenames or their acoustic fingerprints.
  • Transcode audio to any format you like.
  • Check your library for duplicate tracks and albums or for albums that are missing tracks
  • Browse your music library graphically through a Web browser and play it in any browser that supports HTML5 Audio and lots more.

MacOS / Linux / Unix

Website

gnudb.org ~ CD metadata database

gnudb.org ~ a new home for the freedb database

How to use gnudb.org:

Configure your CDDB or freedb-aware software to point to gnudb.gnudb.org as your CDDB / freedb-server.

All official gnudb servers are running cddbp at port 8880 and http at port 80

The path for http-access is /~cddb/cddb.cgi

Access a xmcd file directly when you know the genre and discid at:

http://www.gnudb.org/gnudb/genre/discid

Example ~ http://www.gnudb.org/gnudb/rock/390f1215

Source: gnudb.org CD database