Mockupea - Mockupea is an online tool for creating 3d book mockups with a lot of features.
GoodBooks.io - Largest curated collection of 8,500+ book recommendations.
Stackoverflow '90s - Bring back '90s to Stackoverflow with this extension
BookAuthority - BookAuthority collects the most recommended books on business, technology and science - as featured on CNN, Inc and Forbes
Box Shadow Generator - Generating CSS3 multilayer box-shadow has never been easier.
Most Recommended Books - Books recommended by the world's most successful people