a database of 1317 companies who went throught the Y Combinator accelerator program between 2005 and 2017 and a whole bunch of metrics about them
Startup School 2018 - from Y Combinator is a free online course for startups.
The most comprehensive and up-to-date public dataset on Y Combinator companies, with all batches from 2005 to 2018. Maintained by Snappr.
Work at a Startup - from Y Combinator is a common application to apply to hundreds of top startups.
How it works: Applicants fill out an application with their background and experience. Then, Y Combinator-alum companies browse through applications and start a conversation with people they are interested in.
Office Hours Cards is a card deck to help you to prepare for an accelerator pitch, startup presentation or even a demo at a Startup Weekend or Hackathon!
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.)