Four Hour Book Club - 300+ Books recommended on the Tim Ferriss Show 📚
Goodreads - See what your friends are reading.
LibraryThing - A home for your books.
Bookstash - Bookstash is a free library of curated summaries from top nonfiction books.
BookAuthority - BookAuthority collects the most recommended books on business, technology and science - as featured on CNN, Inc and Forbes
GoodBooks.io - Largest curated collection of 8,500+ book recommendations.