There is a Photoshop action, that will make double exposure photos.

Important!
Before you can use this action make sure:
- photoshop language is set to Englisn.
- Checkbox “Add ‘copy’ to Copied Layers and Groups” is cheched in Layers Panel Options window.
- The action has been tested on Photoshop (English versions) CC 2015 and CS5.

How to install:
Open Double Exposure.atn in Photoshop by double-click or use ‘Load actions’ menu item in Actions window

How to use:
- Open image in photoshop
- Be sure the document has background layer called ‘Background’
- Place your second image into the document by menu File -> Place (or File -> Place Embedded in newer versions)
- Rename the secod image layer to “start”
- Run the action and enjoy the result!