The Y Combinator Database - The definitive database of YC companies with all the metrics
The Product Management guide - A book on how to create and ship products that people love
Y Combinator Companies - Interactive list of all 1000+ YC companies
Xobin - Most Comprehesive Pre-Employment skills testing and Psychometric Assessment Platform.
Startup School - How to start a startup, by Y Combinator
Intercom on Product Management - The ultimate resource for aspiring product managers