Vintager

This is a neat application that lets you add various effects to photos and is also capable of making your pictures look vintage, hence the name of the program.

Vintager lets you apply various filters and effects to your photos and change their look with just one single, simple mouse click. It also lets you perform various color adjustments as well as rotate, crop, and resize the photos. As you can see, this handy tool can be used successfully for other purposes than just to add a retro look to some of your photos. Anyway, when it comes to making photos look old, the results that Vintager provides are truly amazing, as it also lets you use frames, textures and blur/bokeh effects for a truly vintage final aspect of the photos.

Vintager is also really easy-to-use. Though it doesn't support batch processing and it can operate on only one photo at a time, it's really simple and straightforward. Its intuitive interface can be used without any problem even by complete beginners.

To sum it all up, Vintager is not very complex, but it provides really cool results and it offers a truly easy manner of making photos look old. Best of all, it's also completely free.