A free program for Android, by Backs Infotech.

Dual Camera: Front & Back Cam is the best free photography app with a creative way of using both front and back cameras in one image. If you want to get the best selfie, this app is your best choice. You can take selfies and use the front camera to show your live reaction. If you want to take a group photo, you can now add yourself and your friend to the photo. 

The Dual Camera: Front & Back Cam offers many functions such as photo and video editing, filters, stickers, etc. It allows you to add the best effects and stickers to your photos and videos.