Software Product Management Stack - Resources & tools to help you manage your software product
The Product Folks - A volunteer-led community of product managers and makers
Product School - The global leader in product management training
The Product Management guide - A book on how to create and ship products that people love
Sunsama - Calendar and scheduling for teams
The Product Manifesto - Product Managers face the biggest challenges of our day, which is why our community needs a common set of product principles.