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.

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!

Abacus - Expenses without the 'expense report'

Dinngo - Splitting payments the fun and easy way

Rydoo - Rydoo is a Travel and Expense management system.

/Tab - The simple way to split a bill among friends.