Pack - Makes it simple to find the best roommates.
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!
Roomr - Discover great people to live with
Kittysplit - The easiest way of sharing costs with a group of friends
OurFlat - Groceries, bills, calendar, chores & chat for any household.
ihatemoney - Manage your shared expenses, easily