TRIBE Group - TRIBE is a self-serve marketplace connecting social media influencers with leading brands to create social media campaigns.
The Product Manifesto - Product Managers face the biggest challenges of our day, which is why our community needs a common set of product principles.
Productbox - Talk with fellow product managers about how you do stuff.
The Product Folks - A volunteer-led community of product managers and makers
SnakeLogic - The puzzle based snake game
The Product Management guide - A book on how to create and ship products that people love