A free app for Android, by Roxanne Crete.

The Dual Camera app lets you photograph both yourself and your loved ones using the front and back cameras on your phone. You can capture both the person and the environment around them and save the pictures to your device or upload them to a service like Facebook or Instagram. 

You can apply cool filters and add stickers to make the pictures more interesting. You can also add two different images together to make a new photograph. You can use either the front or back camera and take pictures as soon as the other one is ready. You can use the front camera for selfies and the back camera for your outdoor adventures.