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!

Fly Cash - Expense tracking as easy as chatting

Kittysplit - The easiest way of sharing costs with a group of friends

5coins - A simple app to track your daily expenses

ihatemoney - Manage your shared expenses, easily

Untax - Keep track of your small business's expenses without keeping receipts or manual data entry.