Like GoodReads, but tired of Amazon? BookWyrm might be what you're looking for.
Old, but just in case folks don't know about this...
EDIT: I was stunned at all the upvotes this got, and from a two-year-old article to boot! I hope I didn't do anything to overload their servers. When I posted about the Instagram/Pixelfed import tool, I was kind of surprised at how many folks that were on Lemmy didn't already know about Pixelfed, which is why I posted this, also from We Distribute. For a long while, IIRC, the Fediverse pie chart was taken up almost entirely by Mastodon (which it probably still is) followed by a small but visible sliver of Pixelfed--Lemmy hardly registed at all. Just goes to show how fast we've grown!
EDIT EDIT: I see that some of you were a little bit disappointed with BookWyrm, but I hope you will stick with them because I think they can be an important member of the Fediverse. The sense that I get is that they're stretched very thin, and could use some support, monetarily of course, but especially from other developers.
OMG, there's a third party app with dark mode!!!! Goodreads app doesn't have it, which I hate with a passion... I'm sold, just started the import process of my books from goodreads to bookwyrm!