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!
Lumoid Locals - Peer-to-peer marketplace for short-term gadget rentals
Splittable - Shared living made simple
Nespresso Index - The caffeinated version of the Big Mac Index.
EquiTable - Split the bill fairly
CUPS - Discovery and payment platform for the best local cafes