Undeleter

Undeleter is an app that, as its name indicates, lets you recover files and documents you thought were gone forever. It also gives you the possibility to permanently destroy any type of file, so that they can never be recovered using an app like this one.

The interface in Undeleter is clear and organized. Its three main features are perfectly separated: restore files, restore data, and destroy documents. With the first one, you can recover images, audio, or video files that you've deleted from you device. The second option lets you restore data from other apps and SMS. The third feature lets you permanently destroy any file stored on your Android.

Undeleter is one of those apps that you hope you'll never need to use ... but could come in handy from time to time. That's why it's a good app to have just in case you ever need it.