GoodBooks.io - Largest curated collection of 8,500+ book recommendations.
Makerlog - Makerlog is the dead-simple task log that helps you stay productive and ship faster.
BookAuthority - BookAuthority collects the most recommended books on business, technology and science - as featured on CNN, Inc and Forbes
MakerWidget - An embeddable portfolio for your (side) projects
Goodreads - See what your friends are reading.
Indie Hackers - Connect with fellow entrepreneurs, developers, and bootstrappers who are sharing the strategies and revenue numbers behind their companies.