Software Product Management Stack - Resources & tools to help you manage your software product
ZenHub - ZenHub is how the world's best software teams work together. Trusted by NASA, Docker, and Rackspace. Start free today!
The Product Management guide - A book on how to create and ship products that people love
Zenkit Projects - Plan. Act. Smile.
Product Management Exercises - A repository of product manager job interview exercises
Nifty - Manage projects, work, and communications in one place.