Nifty - Manage projects, work, and communications in one place.
PM Starter Pack - Practical guide on how to get started in product management
ZenHub - ZenHub is how the world's best software teams work together. Trusted by NASA, Docker, and Rackspace. Start free today!
Product School - The global leader in product management training
Product Frameworks - Discover product frameworks used to help build products
know/how Product Managers - A weekly newsletter with 5 practical tweet-length PM tips