GoodBooks.io - Largest curated collection of 8,500+ book recommendations.
Bookstash - Bookstash is a free library of curated summaries from top nonfiction books.
Goodreads - See what your friends are reading.
Instaread - Read or hear key takeaways of any book in minutes
Read This Twice - Verified book recommendations from people we look up to
Book Video Club - Quick video summaries of the top business books for startups