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Free, but you need to upgrade to TripIt Pro to get full benefit
Frequent travelers are probably aware of the online service, TripIt. It builds travel itineraries from confirmation emails from airlines, hotes, and car rental agencies. These itineraries make a complete picture of upcoming trips, and it all can be easily synced to calendars.
The TripIt Pro Android app is a convenient way to access the online service, optimized for the phone screen. In addition to the trip overview screen (shown above), it is easy to drill down into any event in the list to get details. It also integrates with Google Maps to give instant maps with navigation from airports to hotels.