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
The Product Folks - A volunteer-led community of product managers and makers
Sunsama - Calendar and scheduling for teams
Product Management Templates - 9 essential templates created by product leaders
Intercom on Product Management - The ultimate resource for aspiring product managers