Nawvel - Nawvel is a handy-dandy library of tried, tested & curated resources.
Software Product Management Stack - Resources & tools to help you manage your software product
Startup Network - Predicting successful startups using AngelList data
The Product Management guide - A book on how to create and ship products that people love
Google Design Sprint Starter Kit - This Kit helps you to run your first Google Design Sprint.
Product Management Exercises - A repository of product manager job interview exercises