As we are now developing several Magento Extensions we are in the need to create a 3d virtual software box in order to pleasantly present the extensions. So, there are ton of options out there but I wanted to point out to the one that at the end of the day looks the best and is easiest to deal with in my opinion.
The one that I refer to is a Photoshop action which is offered by a French website called TheDom.fr. The specific photoshop action is called 3D Software Box photoshop action. It is free and offered at the link above.
We were able to produce really nice 3d software boxes. One of which you can see on our Runway extension page.