Expensify.com's free Expensify app gives you everything you need to manage expenses while out and about: It offers simple forms for entering expenses, photographing receipts and invoices, and syncing the data to your account at Expensify.com. (Accounts are free for individuals and cost $5 per month per user for companies.)
For even more expense-tracking features, take a peek at ProOnGo's ProOnGo Expense. It can track your mileage using your smartphone's GPS, track time spent with clients, and export all of your data to QuickBooks or to your own custom expense template. ProOnGo charges per user per month, with plans ranging from $27 for 5 users to $290 for 100 users.
Square, created by Twitter co-founder Jack Dorsey, lets you accept credit card payments with your Android smartphone. You'll be sent a special card reader when you sign up for an account. Both the reader and the app are free to use, but Square charges a 2.75 percent fee from each transaction.
Get your travel organized with TripIt. Once you've set up a free account, you just forward all your travel confirmations -- airline plans, hotel bookings, you name it -- to an email address set up for you at tripit.com. The service reads all your plans and translates them into easy-to-follow itineraries, all of which are available within the Android app.
FlightView's $1 FlightView Flight Tracker is a must-have for any frequent flyer. The app gives you real-time status updates on your flights and can even send you alerts when something changes. A widget lets you keep the info right on your home screen, too.
Consistently named one of the best apps for Android, Edward Kim's $4 Car Locator provides a simple way to save your car's location and navigate back to it later.
RideCharge's free Taxi Magic app helps you find a nearby cab, book a ride, and track your cab's location. It works all throughout the United States.
If your travels take you to a foreign land, Google's free Google Translate app could come in incredibly handy. The program provides instant translations between more than 50 languages and offers voice-based input. Capice?
Marc Stogalitis and Mimi Sun's free Gmote lets you use your Android smartphone as a remote control for your PC-based PowerPoint presentations.
For complex business calculations, try Edward Falk's $5 RpnCalc Financial calculator.
Make your smartphone especially intelligent with Probeez's $4 Setting Profiles. The app lets you set custom profiles for your device that can be activated based on your location, the time of day, proximity to events on your calendar, and a slew of other conditions. The profiles can completely control your smartphone's behavior, changing everything from ringer sound and volume to Wi-Fi settings, screen brightness, and even your wallpaper.
Track all of your shipments with Timo Berhmann's free Parcels app. The program supports FedEx, UPS, U.S. Postal Service, DHL, and other mailing services. It can track continuously in the background with the option to activate notifications whenever a package's status changes.
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This story, "Specialty Android apps for business users," was originally published at InfoWorld.com. Follow the latest developments in mobile technology at InfoWorld.com. For the latest developments in business technology news, follow InfoWorld.com on Twitter.