WeShelter - Unlock a donation when you pass a homeless person in NYC
Startup School - How to start a startup, by Y Combinator
TAP London - Tackling the homeless problem together
Apply to YC (Y Combinator) - Curated collection of resources for founders applying to YC.
Giftcard Zen - Buy a gift card at a discount
YC World - Explore Y Combinator companies by country