BookWyrm

 BookWyrm  is a social book reading, reviewing, and personal library site built on open source software that supports ActivityPub.

The source code is available:
 * https://github.com/bookwyrm-social/bookwyrm

History
The project was previously known as FediReads - an ActivityPub based Goodreads like service with https://openlibrary.org/; Demo previously available on Glitch
 * 2020-02-19 Announcement thread: https://twitter.com/tripofmice/status/1230235138341998592 "Are you interested in a federated alternative to Goodreads that doesn't use Amazon? because I'm making a federated alternative to Goodreads that doesn't use Amazon"