7 of 8Image
Company: PocketGuide Inc.
The PocketGuide app is a free audio city guide covering most of Europe and sections of Asia, Africa and the United States. The app determines your location via GPS and relays information automatically when interesting sites are nearby -- but keep in mind that using it while roaming city streets will result in roaming charges. Alternatively, you can donate to the app makers to download audio guides in offline mode.
The Skype iPhone app will have you making calls around the globe with little fuss, and without picking up the bill for high roaming charges. The free application allows you to use a Wi-Fi or data connection to connect and make video or voice calls with other Skype users, or you can pay for a Skype number to make calls to standard cells.
The TripAdvisor app is a popular way to save some cash, find out where the best tourist attractions and restaurants, how best to travel between place to place and to book cheap hotels and flights. The most useful feature I find to be is the forums, where you can seek honest advice about your travel plans.