GoodBooks.io - Largest curated collection of 8,500+ book recommendations.
PastBook - PastBook is an online service that allows you to create your own beautiful photobooks and share them with friends and family.
BookAuthority - BookAuthority collects the most recommended books on business, technology and science - as featured on CNN, Inc and Forbes
Timehop - Your digital life history
Goodreads - See what your friends are reading.
Optimalprint Photo Book Series - Beautiful, automatic & sustainable photo books