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23. GlobeTipping
If you have ever been abroad and weren't sure whether you should tip or not, then GlobeTipping is a must. In the States we tip 20% for nearly everything, but in other countries that might be an embarrassing - or even insulting! - amount. 

In GlobeTipping, you put in what kind of service you had and what country you're in, and the app will let you know what the custom is. Not only will it nix any of the social anxiety that comes with tipping abroad, but it will save you from spending unnecessary money!