GoodBooks.io - Largest curated collection of 8,500+ book recommendations.
Goodreads - See what your friends are reading.
Bookicious - Find the best new book to read with books collections for makers, founders and entrepreneurs.
Readernaut - We are a small community of readers, sharing our adventures and supporting each other as we persue a life of learning.
Oku - Track your book lists and get recs from your friends
LibraryThing - A home for your books.