After years of toil the free music encyclopedia MusicBrainz is now backed by a nonprofit foundation with a fantastic best-of-the-usual-suspects board.

MusicBrainz has taken an innovative approach to open data: core factual information (artist, album, track) is appropriately dedicated to the public domain, while community generated information is licensed under Attribution-NonCommercial-ShareAlike.

Also check out MetaBrainz’s exemplary practice of keeping transparent finances.