免費的樂高模擬設計軟體，還有許多別人製作的圖庫可以參考下載。大人小孩都適合。
Bricksmith allows you to create virtual instructions for your Lego creations on your Mac. The magic is based on the LDraw library, a collection of 3D models of Lego building blocks created by enthusiasts from around the world. With Bricksmith, you never have to worry about running out of parts!
