The Y Combinator Database - The definitive database of YC companies with all the metrics
YC World - Explore Y Combinator companies by country
Y Combinator Companies - Interactive list of all 1000+ YC companies
Startup School - How to start a startup, by Y Combinator
Unicorn Republic - List of startups that evolved into $1 billion+ corporations
YC Interview Practice App - Get asked YC questions by Sam Altman