i3DPhotoCam is a camera application for taking 3D photos.
You can take two pictures by shifting them left and right and save them in SBS format. Furthermore, on iPhones with two or more rear cameras, you can take synchronized photos with the cameras lined up on the left and right sides of the back.
It can also be used in combination with the latest i3DSteroid, just like the camera function of the same application.
This is a free app, but in-app purchases are required to save high-resolution images.