BudgetDuo - Easily determine your share of household expenses
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!
Splittable - Shared living made simple
EquiTable - Split the bill fairly
Oikon - Manage your expenses
Dinngo - Splitting payments the fun and easy way