GoodBooks.io - Largest curated collection of 8,500+ book recommendations.
Quotefancy - Quotefancy is on a mission of turning inspiring quotes into beautiful wallpapers.
BookAuthority - BookAuthority collects the most recommended books on business, technology and science - as featured on CNN, Inc and Forbes
Brainyquote - Database of quotations by topic or author.
Goodreads - See what your friends are reading.
Quotemarks - Quotation application.