The Product Manifesto - Product Managers face the biggest challenges of our day, which is why our community needs a common set of product principles.
The Product Management guide - A book on how to create and ship products that people love
Product Management Exercises - A repository of product manager job interview exercises
Nifty - Manage projects, work, and communications in one place.
Woven Calendar - An intelligent calendar
Intercom on Product Management - The ultimate resource for aspiring product managers