NeoDB is committed to creating a free, open, and interconnected space for collecting and reviewing books, movies, music, games, and podcasts.

Having used BookWyrm and NeoDB, it's definitely very comparable to GoodReads vs IMDB, at least in terms of interface/user experience/aesthetics/etc. BookWyrm being specifically for books, it has a ton of fields that wouldn't be applicable to anything else, i.e. "publisher", " ISBN". It can pull data automatically from some outside book databases. NeoDB seems able to do that same thing, except for any kind of media. Not sure where all they're pulling the data from. They also seem to have fields for just about anything, from tracklist to director to author.