Teamwork - The Project Management App for Professionals. The most powerful and simple way to collaborate with your team.
Intercom on Product Management - The ultimate resource for aspiring product managers
Zenkit - Zenkit is the home you always wanted for your ideas, your projects, your business.
Product School - The global leader in product management training
Elegantt for Trello - The most elegant way to manage your Trello projects
The Product Folks - A volunteer-led community of product managers and makers