ZenHub - ZenHub is how the world's best software teams work together. Trusted by NASA, Docker, and Rackspace. Start free today!
The Product Manifesto - Product Managers face the biggest challenges of our day, which is why our community needs a common set of product principles.
Intercom on Product Management - The ultimate resource for aspiring product managers
Product Management Exercises - A repository of product manager job interview exercises
Zenkit Projects - Plan. Act. Smile.
Nifty - Manage projects, work, and communications in one place.