Passport Index 2016 - View the world's passports and see how they rank
Y Combinator Companies - Interactive list of all 1000+ YC companies
Two Centuries of U.S. Immigration - Visualizing who immigrated to the U.S. between 1820 and 2013
Apply to YC (Y Combinator) - Curated collection of resources for founders applying to YC.
EasyStats - Easily slice & dice U.S. Census data; Download into Excel.
Startup School - How to start a startup, by Y Combinator