Tales Untold - Smart stories for smart kids (and smart parents, too).
Intercom on Product Management - The ultimate resource for aspiring product managers
Storiella - Storiella has been founded by two former teachers who are now parents.
The Product Management guide - A book on how to create and ship products that people love
Hullabalu - Interactive stories for kids
Software Product Management Stack - Resources & tools to help you manage your software product