The Product Manifesto - Product Managers face the biggest challenges of our day, which is why our community needs a common set of product principles.
Google Calendar - Spend less time managing your day & more time enjoying it
The Product Folks - A volunteer-led community of product managers and makers
Mixmax Calendar - The fastest way to schedule meetings with anyone, anywhere
The Product Management guide - A book on how to create and ship products that people love
Sunsama - Calendar and scheduling for teams