Open Library is an free, online California Library with millions of digital books to read and borrow. It's additionally an open catalog of millions of books which you may track like goodreads.
Best part? If it's not to your liking, the whole project is open source! https://github.com/internetarchive/openlibrary
Open Library has a very strong volunteer tribe of book-loving librarians, developers, and designers working to make the project better for our community.
We meet once a week at 11:30am PT. Ask me for the link: mek+ol@archive.org
RIGOROUS BOOK RECOMMENDATIONS: We're also cultivating a 2nd non-profit open source experiment called TheBestBookOn.com (it leverages Open Library's catalog) which allows book-lovers to ask for or make rigorous book recommendations:
https://github.com/Open-Book-Genome-Project/TheBestBookOn.co...
It's a very early prototype (we discuss development during our weekly Open Library call). It's being organized by Lauren Milliken, Aasif Khan, and myself and we'd love more contributors to join the discussion: mek+bbo@archive.org