Bookicious - Find the best new book to read with books collections for makers, founders and entrepreneurs.
Wisebooks - Free database of books recommended by world-class people
Goodreads - See what your friends are reading.
Highly Reco - Book recommendations by awesome people
BookAuthority - BookAuthority collects the most recommended books on business, technology and science - as featured on CNN, Inc and Forbes
Booknshelf - Social book and bookshelf discovery platform.