Startup Stash - A curated directory of 400 resources & tools for startups
The Y Combinator Database - The definitive database of YC companies with all the metrics
ProppyJS - Functional props composition for UI components (React & Vue)
Startup School - How to start a startup, by Y Combinator
Devhints - TL;DR for developer documentation
Y Combinator Companies - Interactive list of all 1000+ YC companies