Tech Republic columnist Jack Wallen rounds up the five most useful applications for business travelers. The list ranges from Packing List, an app that helps you pack, to Expensify, which helps you keep track of business expenses. "If you're a frequent flier, and you're looking to make all those miles a bit easier, give one (or more) of these apps/services a try and see if they don't add a little efficiency and joy to your business trips," Wallen writes.

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