- freedb - http://www.freedb.org/
Audio CD database using GPL software.
- Gracenote - http://www.gracenote.com/
The CD Data Base (formely CDDB). Enabled CD players can query for playlists.
- Poqqo - http://ucsub.colorado.edu/~kominek/poqqo/
A CD data server.
- Music Brainz - http://www.musicbrainz.org/
Project intended to be an OpenSource replacement for the existing system of looking up audio CDs on the Internet.
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