GoodBooks.io - Largest curated collection of 8,500+ book recommendations.
Inkdit - Electronic Signature
Read This Twice - Verified book recommendations from people we look up to
iReader - iReader is one of the most accomplished ways to read the books right from your smartphones.
Goodreads - See what your friends are reading.
Booksie.com - Booksie is a free online publishing site that allows writers to easily post, share, and promote their writing.