Rippling - One directory for employee information across IT, HR, legal, finance and facilities.
Startup School - How to start a startup, by Y Combinator
Stiki - Employee onboarding made simple
The Y Combinator Database - The definitive database of YC companies with all the metrics
Slite - Your company knowledge
Apply to YC (Y Combinator) - Curated collection of resources for founders applying to YC.