Fast Talk
If it's a language barrier that's keeping you from traveling then this is definitely the app for you. Lonely Planet's Fast Talk app will make you a confident conversationalist with it's hundreds of phrases from the world's top languages. Fast talk has phrases in French, German, Italian, Latin American Spanish, or European Spanish and you can even browse through them during your plane ride because the app works great offline.
Go here to download Fast Talk.
[Photo via @lonelyplanet]