If you cannot afford Photoshop...

[Urbz]

GIMP is the GNU Image Manipulation Program. It is a freely distributed piece of software for such tasks as photo retouching, image composition and image authoring. It works on many operating systems, in many languages.

www.gimp.org/

GIMP is a very powerful and free program that does many of the things that Photoshop does.

[Urbz]

Creating a 3D effect with image editing software (GIMP or Photoshop)
Here's how to make a neat effect to make it look like the subject of a photo is popping out of the background. This can be done with GIMP (GNU Image Manipulation Program) or Photoshop

www.instructables.com/id/E6G7L91G9AEXCFGBTI