The Y Combinator Database - The definitive database of YC companies with all the metrics
Mapbox - An open source mapping platform for custom designed maps. Our APIs and SDKs are the building blocks to integrate location into any mobile or web app.
Startup School - How to start a startup, by Y Combinator
uMap - uMap let you create maps with OpenStreetMap layers in a minute and embed them in your site.
Apply to YC (Y Combinator) - Curated collection of resources for founders applying to YC.
Google Maps - Find local businesses, view maps and get driving directions in Google Maps.