Intercom on Product Management - The ultimate resource for aspiring product managers
userinput.io - Get on-demand feedback for your app, website or idea. Learn how to improve by hearing real opinions.
The Product Management guide - A book on how to create and ship products that people love
ithinki - A simple user feedback tool for start-ups
Software Product Management Stack - Resources & tools to help you manage your software product
Product Management Exercises - A repository of product manager job interview exercises