This might sound silly application, but who has never needed a Flashlight?
With this Torch you can also send your own Morse code at your preferred speed and with/without sounds.
The main features:
Supported languages: English, Italian, French, German, Spanish
Note that your smartphone must support the torch mode for the camera flash, if not supported the app will close with a message about unsupported feature.
Also you can't access the camera unless the app is in background (this to comply with Google's requirements)