Nifty - Manage projects, work, and communications in one place.
Product Snacks - Bite-sized learning cards for product managers
Intercom on Product Management - The ultimate resource for aspiring product managers
Dash for Tumblr - Easiest way to learn to build Tumble themes
Party Line - Use Slack to manage your projects
know/how Product Managers - A weekly newsletter with 5 practical tweet-length PM tips