Joinery.nyc - Connect with outgoing tenants instead of brokers.
RentHoop - Tinder for finding roommates
PadMapper - A free tool to help you find an apartment or sublet to rent.
Splitwise - Splitwise is a free tool for friends and roommates to track bills and other shared expenses, so that everyone gets paid back. On the web, iPhone, and Android!
Rentlogic - Apartment building grades based on facts, not opinions
Pack - Makes it simple to find the best roommates.