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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.

Beets is the media library management system for obsessive-compulsive music geeks. 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. It then provides a bouquet of tools for manipulating and accessing your music.

Gracenote, Inc., formerly called CDDB (Compact Disc Data Base), is a company that maintains and licenses an Internet-accessible database containing information about the contents of audio compact discs and vinyl records. It provides software and metadata to businesses that enable their customers to manage and search digital media. Gracenote provides its media management technology and global media database of digital entertainment information to the mobile, automobile, portable, home, and PC markets. Several computer software applications that are capable of playing CDs, such as Winamp, Sony Media Go, and iTunes, use Gracenote's CDDB technology. Gracenote’s database was originally created from and continues to receive voluntary contributions from users. This led to a licensing controversy when Gracenote became commercialized. »

ACRCloud provides best audio fingerprinting services for companies and developers to build ACR ( Automatic Content Recognition ) abilities such as audios and videos recognition, broadcast monitoring ( music / ads ) , live TV channel detection, copyright detection and so on.

Demlo organizes your music library automatically and dynamically. It runs a chain of user-defined scripts using variables such as tags and file properties. This way it yields virtually unlimited customization power to the user.