A free program for Android, by Insta Image Editor.

Real Time Cartoon Effect is an app that lets you turn photos into cartoon drawings with one click. It’s the perfect photo-to-photo conversion tool for fun photo editing, and you can use it on both your front and back cameras.

With this application, you can capture the best moments in real time and convert them to cartoon with one single touch. You can even apply multiple effects to your photos and share them with your friends. 

The best part of this app is that it works on both the front and back cameras. You can use the front camera to capture the moment and apply the effects, and then you can use the back camera to preview the result.