Goodreads - See what your friends are reading.

Meet New Books - Suggestions on books to read next. Find books that are similar to what you've read before. See what readers recommend. You can also search by trope or genre: romance books, fantasy books, paranormal books. Look for fiction or non-fiction, and more.

What Should I Read Next? - Book recommendations

Oku - Track your book lists and get recs from your friends

LibraryThing - A home for your books.

Bookology - Monitor progress by page or percentage, organize collections, use a reading timer with session logs, jot notes, rate finished books, analyze daily activity on a visual calendar, sync across devices, and access advanced stats through Pro for reading …