Intercom on Product Management - The ultimate resource for aspiring product managers
Product School - The global leader in product management training
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
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.