Product School - The global leader in product management training
Anima App - Design, get feedback, convert to code, publish, iterate.
The Product Manifesto - Product Managers face the biggest challenges of our day, which is why our community needs a common set of product principles.
Sketch Repo - Collection of resources for anyone who uses Sketch
Intercom on Product Management - The ultimate resource for aspiring product managers
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.