Everlance - The #1-rated mileage and expense tracking app
Abacus - Expenses without the 'expense report'
Tour - Automatic mileage tracking with iBeacon + Foursquare support
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.
MileWiz - Automatic Mileage Tracking
Spendesk - Smart spending solution for agile teams