Splittable - Shared living made simple
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!
EquiTable - Split the bill fairly
Evenfy - A free tool to manage household IOUs with roommates, split bills and track group expenses so that everyone gets paid back. On the web, iPhone, and Android.
Spend Together - Spend more time on things that matter, rather that arguing about who owes whom and how much
Jottr - Split expenses using only email, for free