Okay, well... I use GIMP for all of my post production, which is free software that works with most operating systems. For this picture, all I really did was play with the curves until I got the color combination that I liked. I then added a black radial gradient so that the outermost portions of the photo would be a little darker, and then for the curved edges, I used the rectangle select tool and set it to have rounded corners, and then I simply tilted the image a bit so that it looked as though I scanned it in myself.I might make a tutorial sometime soon, if I do I'll let you know. There are plenty of GIMP tutorials for playing with the curves to achieve a retro/vintage feel.If you need any help, feel free to message me!