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This app that lets you calculate cab fares around the world - and helps you work out how much local currency to take on your next business trip.
There are many similar apps that are geared for individual citiesl
You can pick one of several apps track what time your flight or maybe a colleague or customer's flight will be arriving.
This personal finance app lets you keep track of your expenses, organize your personal income, and plan your budget. It lets you build charts and graphs, warn you of upcoming bills, and track your credit card usage.
Price: $3.99 but there is a free stripped down version.