That’s what I listed a bunch of other book databases
Unfortunately, I don’t think there’s an equivalent of TMDB for books. The main issue is especially international coverage. You can probably find decent open data for books in a single language but I haven’t found a good database that covers multiple languages well.
I read books in four languages (English, French, German and Japanese) and tried many book tracking services over the years and couldn’t find one that had good coverage in all languages I need.
That’s not the case for Trakt/TMDB. While its coverage of non-English media is noticeably worse, it still has decent coverage, even for obscure non-English titles. Trakt is really creating a great UX on top of the TMDB data but they’re not in a capacity to start a database of this size and complexity on their own.
E.g. I just did a search of a Japanese book off the top of my head and only WorldCat found it, Open Library, GoogleBooks and ISBNdb all found nothing.
Excellent list. I’d like to add one to it, if I may:
BookBrainz: from the same people that brought us MusicBrainz that’s likewise 100% free and includes an API and webservice for exposing the information. It’s very much a work-in-progress, but that offers its own advantages in that they’re still completely open to what it should record and how it can be consumed. Really all of their projects are a ton of fun to collaborate on, and in particular I find that ListenBrainz scratches a lot of the same itches with music that Trakt does with movies and television for me.
I’ve been searching for a Goodreads alternative and it would be great if I could track my books along with my TV shows and movies in one place.
I’m honestly surprised nobody has developed a plug-in for Calibre to track reading activity for ebooks.