Makerlog - Makerlog is the dead-simple task log that helps you stay productive and ship faster.

Product School - The global leader in product management training

WIP.co - Work in progress. We are a community of makers who help each other ship product.

The Product Folks - A volunteer-led community of product managers and makers

Indie Hackers - Connect with fellow entrepreneurs, developers, and bootstrappers who are sharing the strategies and revenue numbers behind their companies.

Intercom on Product Management - The ultimate resource for aspiring product managers