Fly Cash - Expense tracking as easy as chatting
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!
5coins - A simple app to track your daily expenses
Dinngo - Splitting payments the fun and easy way
Untax - Keep track of your small business's expenses without keeping receipts or manual data entry.
/Tab - The simple way to split a bill among friends.