YC World is a map that shows where YC companies are from. It’s based on the location of the founders before applying for YC.
🦄 Unicorn Republic is a curated list of startups that evolved into $1 billion+ corporations.
YCensus is basically a work in progress census of Y Combinator startup founders. It's also happens to be an IMDB of YC as well. (NOTE: This is not affiliated with Y Combinator.)