A free program for Android, by Moonsoft.

Mirror Photo Editor Camera is a free photo editing app that can create mirror images in seconds. This is the easiest and best app to create mirror images. It has a simple user interface, so even people with no knowledge of photo editing can use it easily. It allows you to change the mirroring style, add frames and text, and make the images more interesting. You can make the images more beautiful by adding different effects.

It is a very simple app with a very simple user interface, so even people with no knowledge of photo editing can use it easily.