Noonie, I've seen your comment on my picture. The 'program' (more a game) I used is 'Garrys Mod', a sandbox game, in which you can create everything you can imagine, when you have the right things. It's a game, which can be bought via Steam for 10€. I'll give you the page's link, so you can decide for yourself.
http://store.steampowered.com/app/4000/