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Unity 3D is a free, and quite simple to use program for making 3-D videogames (and also 2-D, but you may be better looking elsewhere). It's easy to find help, and to avoid scripting by using our search engine of choice, and a lot of basic things are taken care of for you (physics, for example). With a copy og the program and an open Internet browser you should be able to have your first 3-D thing running in an hour or less.