How can i get an effect split in half on a photo?

Can anyone recommend me a program to get this effect

image

Any graphics program can do this, it should even be possible with Paint.
GIMP can do it, and so can Paint.NET, both are free.
And Photoshop of course.

You can even do it online here: http://pixlr.com/editor

(As with 99% of similar "effects", this isn't a special effect but just the result of some simple operations. In this case, selecting one half of the image, mirroring it horizontally and moving it sideways.)

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