Intercom on Product Management - The ultimate resource for aspiring product managers
Incoming Feedback by Hotjar - Instant visual feedback for your website or app!
Product School - The global leader in product management training
ProductBoard Customer Feedback Portal - Share feature plans and collect feedback at scale for free
The Product Management guide - A book on how to create and ship products that people love
Canny - Canny helps you collect and organize feature requests to better understand customer needs and prioritize your roadmap.