It is an application that allows you to create your own Lego model. You can use it to design any project you have in mind, or modify any of the predesignated projects included in the program. One of its features is that you can create automatically a custom box with all the parts needed for constructing your project with real Lego blocks.
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http://ldd.lego.com/en-us/default.aspx?icmp=COUSCreateShareSL100LDD