Goodreads - See what your friends are reading.
SMMRY - Summarize articles, text, websites, essays and documents for free with SMMRY.
LibraryThing - A home for your books.
SummarizeBot - A blockchain-powered bot that summarizes information for you
BookAuthority - BookAuthority collects the most recommended books on business, technology and science - as featured on CNN, Inc and Forbes
TLDR This - Automatically summarize any article or webpage in a click.