Halfdollar - Free and elaborate spreadsheet budgeting.
Splittable - Shared living made simple
BeeWise - Automagically track your daily expenses. No manual entry.
/Tab - The simple way to split a bill among friends.
Verse Groups - Group expenses and payments, simplified.
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!