Nifty - Manage projects, work, and communications in one place.
The Product Manifesto - Product Managers face the biggest challenges of our day, which is why our community needs a common set of product principles.
Calendly - Say goodbye to phone and email tag for finding the perfect meeting time with Calendly. It's 100% free, super easy to use and you'll love our customer service.
The Product Management guide - A book on how to create and ship products that people love
FreeBusy - Easiest way to share availability across calendars for free
Board for Github - A webview based GitHub project app with native features