One Random Book - Why not let us choose your next read?
GoodBooks.io - Largest curated collection of 8,500+ book recommendations.
Knowall - Book Recommendations from Friends
BookAuthority - BookAuthority collects the most recommended books on business, technology and science - as featured on CNN, Inc and Forbes
Rocket Reads - A simpler alternative to Goodreads
Most Recommended Books - Books recommended by the world's most successful people