The Y Combinator Database - The definitive database of YC companies with all the metrics
Startup Stash - A curated directory of 400 resources & tools for startups
Startup School - How to start a startup, by Y Combinator
From Startups For Startups - 50+ Hours of curated Interviews & podcasts
Y Combinator Companies - Interactive list of all 1000+ YC companies
Xtensio - Xtensio is a flexible platform to create, collaborate, share and present beautiful business documents.