Lego Digital Designer
Lego Digital Designer, or LDD, is a free computer program produced by the Lego Group via Design By me for Mac and Windows platforms.
The program allows users to build models using virtual Lego bricks, in a computer-aided design like manner.
These can be uploaded, along with instructions and a box design, to the Lego Design By Me website, from where the models can be ordered for delivery as a real, packaged set.
Users can also take "screenshots" of their models and store the models on their computer in a .LDD File
