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!

Expensify - Import expenses directly from a credit card to create free expense reports quickly. Approve reports online and reimburse directly to a checking account with one click.

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

Abacus - Expenses without the 'expense report'

ihatemoney - Manage your shared expenses, easily

Zoho Expense - Automate your expense reporting process and streamline the approval flow.