Blinkist - Key insights from 6,000+ bestselling books and podcasts
Four Minute Books - Making you smarter in 4 minutes or less.
StoryShots - Read, watch or listen to bestsellers in minutes. For FREE.
Instaread - Read or hear key takeaways of any book in minutes
GetAbstract.com - Book Summaries, Book Abstracts
SparkNotes - SparkNotes is a resource that provided study guides for multiple different types of subjects.