1. Google Maps
2. TSC Music
3. Weather Underground
This app for iPhone has already got huge popularity because of its cool features. If you are a very busy person want to use your time for maximum productivity, this app is for you. This is from the traditional to-do list. With Evernote, you can save all your necessary files in a cloud service, and that is there is no chance of missing a single file even if your phone lost. This app is free.
5. Snap Chat
If you think about the popularity of an app, Snap Chat will be on the list. This app allows its users to do video chat with different people. This is so much funny. There are so many filters which you can use for various purposes. If you send a clip, it will be deleted automatically after 10 seconds.